AR400 Welding & Machining | Associated Steel Corporation Sent by telegraph using Tap. 223 and it just leaves tiny dimples. A656 Steel Plate . Ultra-Wear-Resistant AR500 Carbon Steel. 187) & possibly 1/4" (. Duplex and Super Duplex Stainless Steel (Grades 31803, 32750) 10I. Difficult to weld: Higher alloy and greater Carbon content require precise preheat and welding procedures. The AR400 is also quite hard and strong, but it’s highly regarded for its resistance to both corrosion and impact abrasion. AISI 4330 alloy steel is preheated and post heated based on the welding procedure used for this alloy steel type, and the alloy can be joined by a brazing process. Custom sizes available. AR400 | AR400F Steel Plate. 75t (where t is the plate thickness) with the bend axis transverse to the rolling direction. Available in thicknesses from 0. 96” x 576”. At my local steel yard I can buy AR 400 (Abrasion Resistant) in 3/8 thickness for $1. If you're using AR400 I would think most people would have an adequate machine to run 1/16". 96” x 288”. Branches featuring AR400 | AR400F Steel Plate products. 2. Any hydrogen in the weld metal may diffuse into HAZ and may cause hydrogen embrittlement, resulting in. Oxyacetylene welding method is not preferred for welding this alloy. Used a Milwaukee mag drill, made a 3" dia. Uses for this steel include the manufacture of heavy construction equipment. Alpharetta, Georgia 30004. AR400, or. Jan 4, 2001 41,599 19 81. Our wire products have been formulated to be compatible with our premier metals, AR400, AR500, A514, Manganese Steel. C. T21 has a wear life twice that of AR400. Metals Depot stocks hundreds of sizes of steel flat that you can buy online in ready to ship precut or mill lengths. Much like AR450 and AR400, AR500 steel is a specific type of abrasion resistant steel with a surface hardness of 477-534 BHN. Hardox ® 600 has been successfully used in cement. 5t can be used when bending parallel to the roll. It is heat treatable. Often used in construction and mining applications, it can also be found in a variety of other industries. AR600 steel is a durable high-carbon alloy steel with excellent strength that’s supplied nationwide across our 40+ branches. YouTube. 3 – Structural Welding Code – Sheet Steel AWS D1. 75 thru tapped holes. This materials is an Abrasion Resistant, Thru-Hardened, Alloy product. The most common metal you'll find on the competitors currently is AR400, a super strong steel alloy that can be easily acquired, but is a monster to machine or weld with out proper tools. About welding, structural engineering design, forming, bending, cutting, wear and sustainability experts. AR 400F / AR 400 F / AR400. I plan on using 1/4 Ar500 plate but am unsure of the process needed to weld this type of steel. 00. The nickel and molybdenum content gives AR400 carbon steel the ability to resist wear better than all other carbon steel. Hot Rolled Steel Flat, is widely used for all general fabrication and repairs in industrial maintenance, agricultural implements, transportation equipment, etc. It has good weldability. . Ar500 prices, you will notice that Ar500 is usually higher. It is determined based on hardness and it does not have a defined chemistry. The AR400 steel is more known as an abrasion-resistant steel, while the T1 steel is regarded as a structural steel. AR200 and AR400 are both Abrasion Resistant steel plates. 4. Overview. The base steel around the weld rapidly heats and cools during welding, resulting in a heat affected zone (HAZ) with high hardness. Tha AR400 we used lined a log chute and was well supported by structural steel. The steel will be placed in the press brake where a bend or bow is, the top. The best way to test this that I know of is to lay all the sheets out in a long row. 1-BMG:2005 1 Base Metal Grouping for Welding Procedure and Performance Qualification 1. Tags: None. Q: What filler metal should be used to weld AR400 plate? A: Abrasion-resistant steel plates, or AR plates, are designed for long service life in harsh conditions, which is the reason for their incredibly high hardness. Amarillo. Compared to E70T-4, they offer slightly lower deposition rates of up to 30 pounds per hour, but they offer a smoother welding arc and Charpy impact toughness properties. In carbon steel, the carbon content is King. Welding SAE 4130 Steel Tubing. 145 ksi ;. 8, welding becomes a challenge due to the propensity of high hardness in the heat-affected zone and weld metal resulting in weld cracking (Types of Crack in Welding & their prevention) If the right precautions are not considered. As you can see, the mechanical and chemical properties of 1018, the machinability, and the surface finish of 1018 steel are all superior to A36. Everyone refers to wear plate as ARXXX because its like saying Kleenex. Re: ar400 steel 400? Dunno, for rifle, I guess it would be OK at longer ranges. Tha AR400 we used lined a log chute and was well supported by structural steel. arc welding video 2. e. It's widely fabricated into parts that don’t require high strength. The cost of Hardox varies depending on the grade, thickness, and area of the plate required—generally, the prices for Hardox range from $500 to $1200 per tonne. and A. Pre-heating the base material is one way to prevent rapid cooling, reduce hydrogen levels, and prevent cracking. include our Tensaweld Workmate for general purposes and Tensaweld Nickel-90 for increased tensile strength in the weld joint. Rather than buy and weld adapters to the tooth body, I'm planning on flame cutting the body to the profile of the adapter then milling the end of the body to 1. For instance, you may need to weld ASTM A387 chrome-moly steel tubes—for a high-temperature. Typical tensile strength is 180,000 PSI. The number usually refers to the brinell hardness of the plate . Use stringer, do not weave unless necessary. heavier thicknesses for internal soundness. Cut about 20% stepover amount in your toolpath settings. Compared to AR400, the AR450 steel plate offers more hardness without sacrificing formability and ductility. Recommended for: liners for mining and material handling equipment like dump trucks, material transfer chutes, storage bins, buckets, and hopper. To be classified as AR500, the hardness needs to clock in between 477 BHN and 550 BHN. For example : Lincoln 's Lincore 55, Lincore 50 , Lincore15CrMn are all Rc-50 . Do You Need AR400 or an AR500 Steel Plate? Choosing whether you need an AR400 or an AR500 wear resistant steel plate will depend on the application. I haven't bent one yet in spite of my best efforts. Even though it is very expensive steel I want the high impact and high abrasion resistance for my table. However, it’s also more prone to shattering. I used ER-70-S6 to weld it. As a result, customers can expect longer-lasting wear. AR500 — Understanding Abrasion-Resistant Steel. The minimum coating thickness for zinc plating is 0. However, remember that the price of AR400 can. We would love to help you find what you are looking for. AR400 Steel vs. Kromite® #3 and Mirraloy® TGP Welding Guidelines; Kromite® CD Hardness and Strength Comparison Chart; Close; Mirro-Krome 60® (I. Steel suppliers make MIL-DTL or their own products that conform to the mil specs. AR400 is harder than AR200. 5". . Clif-Clad® chromium carbide overlay , Tensalloy™ AR400 and Tensalloy™. 1: Pre-heat the base material. It feeds exceptionally well, so you won’t suffer wire jamming or inconsistent feed rates. 1416 x 10 2 x 1000 = 314,160 mm 3 = 314. Will be using fabricating skills on a daily basis, reading prints and shop drawings and expected to communicate well with peers and supervisors. you can go down to E80, or 9018 but I don't know about using E7018 to weld AR400. I don't know what volts your running on your Mig. Hardness range is 360/440 BHN with a nominal hardness of 400 BHN. AR stands for Abrasion Resistant and will come in designations like AR400 or AR500 and usually offered as-rolled versus normalized (AR 200, 235 and 600 are also available). Stick: If you Google TriCon Tri-Braze, it will bring up the data sheets on the chemistry composition and recommended welding proceedures. ContinuedHardox ® 600 for superior wear resistance. AR400; AR450; AR500; Manganese Steel; AR250; A514; Chocky Bars; 4150 Steel Bar; Scrap & Recycling. Will be welding AR400 and AR500 steel one day and softer steel the next day. A lot of sellers or manufacturers sell zin coated metals under the tag of. Repair steel hydraulic line Heavy Equipment Forums. Welding = Excellent. Hardox is a wear resistant steel; Also, the combination of hardness and toughness made this steel the best choice when looking for both properties. I am thinking of saving a little money and use A36 for my temporary repair. I run an AR500 plate from a well known target manufacturer here on. Any hydrogen in the weld metal of AR400 steel plate may diffuse into HAZ and cause hydrog. We have No Minimum Orders, We Cut to Size. For gas shielded flux cored use a gas mix with 20 to 25% CO2. From researching i have found that E7018 rod will work and that i should preheat to around 300 to 400 degrees. (°c) ea2 + uv420ttr flux & el8 + lincoln 780 flux (for pema) e7018 welding consumable chart er80s-b2 e8018-b2 eb2 + uv420ttr flux 350°c 350°c for. For welding coated and galvanized sheet steels, E71T-14 is the wire of choice. AR is very rigid, very stiff. While AR450 steel is similar to AR400 and AR500, there are some variances that make each unique. It sports a high level of resistance to fatigue, has high ductility, and has good spring qualities useful for applications where flexibility is desired. Preheat, interpass temps, etc. CMC Impact Metals’ advanced heat treating, quench and tempering process produces a superior hardness combined with high strength that results in a lightweight, strong and wear-resistant steel capable of withstanding harsh conditions. jpg. AR400 is quenched and tempered. ABREX 400, also called SUMIHARD 400, is a union of toughness and hardness, giving it the exclusivity to be used in moderate wear areas. As you're sliding across each sheet, the AR400 will stop you dead in your tracks every time. It is a silicon killed, coarse grained steel that requires careful welding techniques. I'm going to have the teeth flame cut from 2" AR400 plate. holes at 16" & 32" going across the 4' way & then 24", 48" & 72" across the 8' way plus welding the perimeter. What is AR400 Steel? The Tensalloy ™ AR400 wear-resistant steel plate is a steel that provides greater impact strength than our other common heat treated alloys. Too tight of a radius bend will tend to crack it on the outside of the radius, though. Wearalloy 450, or AR450, lasts four times longer than other carbon-alloy steel plates. There is no way for a bullet to get to the first plate without sliding down one of the 10 degree plates. 250 in. The AR steel grades include: AR200, AR235, AR Medium, AR400/400F, AR450/450F, AR500/500F, and AR600. Tap. 00/pound for 500. Care must be taken in order to avoid hydrogen induced cracking. Crush wires can also help on tee joints. Kromite® #3 (4140/4150 mod. AR400 or Wearox 100 for abrasion resistance. These elemental differences help the steel achieve a higher surface hardness. E70T-1s are widely used in structural steel fabrication shops. Easy. This is for my workbench. A36 steel plate has good weldability and any welding method can be used. build a smoker grill Cheap Auto Darkening Helmet . That's in 3/8" I buy drops from a guy that fixes garbage trucks and bulldozer blades. To ensure that the T1 steel weld is successful, preheating and post-heating are both essential components of the welding process. S. Temper at about 450 degrees F. These long-lasting, abrasion-resistant steel pipes and wear-resistant steel tubes at a hardness of 400 HBW or 500 HBW can replace costly wear products like hard-faced overlay pipe and. However, one disadvantage is malleability. 7018 and 8018 electrodes should be used with the 500 BHN steel. (1) Specification for Sheet Steel, Zinc-Coated (Galva-nized) by the Hot-Dip Process. This tends to spoil the stability, and helps to break up the jacketed bullets. 4 mm (1 in. A572 steel is a high strength low alloy structural steel known for its versatility. The hardness and general flexibility of AR400 steel plates give them versatility. Storing Low-Hydrogen Electrodes. The base steel around the weld rapidly heats and cools during. AWS D1. It’s not an easy material to machine or weld, it’s even describe it as. Grade 50 high volume. Wear Resistance = Great. We had great success with a 400 deg preheat after tacking. Hardox® 400 is an abrasion-resistant steel with a nominal hardness of 400 HBW. Hardox ® 600 has a nominal hardness of 600 HBW and a uniquely high toughness for such a hard steel. I want to put replaceable teeth on the tips. 4140 steel welding, 4140 steel machining, 4150 steel properties, 316 stainless properties, ar400 properties, ar500 properties. e. 68. 2. Hi, I'm bending a plate of AR400 (20 x4 x3/4 ) 90°, then when the part is in use there is a force on the in the. 005" per tooth or probably about 50 ipm on your machine. Welding can strengthen joints Trusted Source Strength of Joints That Combine Bolts and Welds | Journal of Structural Engineering In steel construction, sometimes bolts and welds must be combined in a single joint. Bucket Bosses. There’s really no single specific chemical composition for AR400 steel, as long as it meets the required hardness level. 1080 Steel is non-alloy steel commonly known as carbon steel, primarily used to create wrought iron products. This plate product is intended for use in applications where a good balance of formability, weldability,. When it comes to 304 stainless steel vs. It was a tumbler drum for some kind of abrasive cleaning system. Alpharetta (Atlanta Plate Processing) 2005 Grassland Pkwy. Ultra-Wear-Resistant AR500 Carbon Steel. General Info About AR600 AR600 is the most durable abrasion resistant steel plate. holdpt (Structural) 18 Dec 12 14:16. Hi Dan, AR400 is approximately 44Rc . Lists five chemical recipes and five different mechanical property ranges for plate products (grades 42, 50, 55, 60, and 65). A514 AR200 abrasion resistant steel plate is a good candidate for some processing techniques. Ultra-Wear-Resistant AR500 Carbon Steel. Ultra-Wear-Resistant AR500 Carbon Steel. AR Plate (trade names such as:"Algoma 500 , AR500, Hardox, etc. Top. The hardened steel must be hard and strong enough to destroy the bullet upon impact completely. While each grade is a pressure vessel quality high carbon low alloy steel plate, tensile strength varies among them. Joined: Fri Jan 07, 2011 4:40 am. Get a quote today! As a result, customers can expect longer-lasting wear parts in some of the toughest applications. ASTM A572 grade 50 steel is a low-alloy high-strength structural steel with a yield strength of 50 ksi (345 MPa) and a tensile strength of 65 ksi (450 MPa). AR400 is quenched and tempered. Carbon Steel Grade Equivalents. Also known as mild steel, low-carbon steel is easy to machine, form, and weld. Rebuilding a backhoe bucket using AR400 steel on a Caterpillar 325 Excavator that was rebuilt from the ground up,. We have 80,000# lift capacity and fabr icate and weld structural steel and medium to heavy plate, primarily to 4 thick mild steel, providing weldments and fabrications to customer specifications in a range of material grades, including: A36, A572, A514, A633, AR400, AR500, Manganese, stainless steel, aluminum and inconnel. Check Latest Price. Need some help with ar400 plate weld procedure. The normalizing process is designed to relieve stresses, which results in improved ductility and toughness. Grades stocked: A514, AR400, AR500, A656-80, A572-50, A36, A588, 4140, 4340. Hardox ® 400 is a trusted steel in the Hardox ® wear plate family, with a heritage of hardness and toughness going all the way back to 1974, when Hardox ® was launched as the world’s first bendable wear steel. Excavator Dipper Arm Weld Failure. Also known as mild steel, low-carbon steel is easy to machine, form, and weld. Corten Steel Plate - A588. Heating will remove the temper, we heat AR to soften it for drilling holes into it. EdDanzer (Mechanical) 11 May 04 10:55. I tested it with 75 rounds and broke out one of the deflector plates. In contrast, the cost of AR400 ranges from $400 to $650 per tonne. AR500 Steel Plate. Welding Ferrous and Non-Ferrous Metals. Welding operators should always follow pre-heating recommendations for the base material to which the AR plate is being welded. Applications: Abrasive / Erosive Wear Protection, Automotive / Vehicular, Chemical / Materials Processing, Marine, Wear Parts / Tooling. Results of this investigation demonstrate how the high strain-hardening capability of the high. MetalsDepot® – AR400 Plate . These elemental differences help the steel achieve a higher surface hardness. 2, W186) plus a “Construction” standard (e. The high-carbon alloy steel grades are determined on the hardness of the steel. We offer Wear Resistance AR 400 Steel Plate . aggregate, and various ground engaging applications. TriCon TriBraze, the Sequel. Can cold rolled be welded with solid welds to the AR400? Thanks in advance. Easy. AR4500 Steel Plate Sizes. Post Thanks / Like - 1 Likes, 0 Dislikes. AR400 steel is standard. Kloeckner Metals stocks ASTM A588 in coil, cut to length, hot rolled, and discrete formats nationwide. Load More . What makes 1080 Steel so popular is the tensile strength of carbon steel. D. 1 – Structural Welding Code - Steel AWS D1. 5425 N Whitaker Road. Uses for this steel include the manufacture of heavy construction equipment. Strength, Yield Strength ksi (MPa), Tensile Strength. 1 and W59. With the addition of our weld wire line, we have brought a new sense of ease and confidence to the wire buying process. Today we will touch base on some key points to look out for when stick welding with 309 rods! It can get messy and a little difficult when you are first star. Search About Contact FAQ +86-371-86151827 [email protected]Share. Keep single pass fillet welds < 1/4 - < 6mm. • High tensile AR400 adjustable steel skidbars • 10’ - 14’ Widths • 38” High mouldboard 60 - 125 HORSEPOWER MAX OPERATING WEIGHT: 20,000 lbs. AR400; AR450; AR500; Manganese Steel; AR250; A514; Chocky Bars;. Piece of 1-1/2" Thick AR400 Steel. AWS D1. AR400 Wear Bar & Strips. This product is intended for applications where a good combination of abrasion resistance, formability, and weldability is desired. The volume of the steel bar is the product of the area of the cross-section and the length: π x r 2 x l = 3. GTAW 용접법 이 방법은 비교적 두께가 얇은 Sheet , Strip 또는 Tubing 등의 용접에 매우적 합하며 현장에서는 Root Pass Welding 및 우수한 용접품질이 요구되는 곳에서 도 사용된다. Ensure mill scale in weld area is removed and the plate is always at a temperature >60F. Any Quantity, Any Size, Delivered Anywhere!Steel Warehouse supplies AR450 steel plate, abrasion-resistant steel with surface hardness 420-470 hardness Brinell. Elongation: 35 %. homemade. This allowed for reliable performance both in the workshop and in operation. AR400 Steel Plate AR400 Steel Plate – Hardness 360-444 Brinell. TruWEAR’s chemical structure and mechanical properties provide for a combination of. 4150 Steel Bar; Tensaweld Welding Wire. Be careful about brackets welded on the back of any target. 1: welding an ar plate to itself or any structure with dissimilar and softer or lower-strength steel In this scenario, the biggest challenge is cracking, which could occur in the weld metal or heat-affected zone (HAZ) of the AR plate due to rapid cooling or highly restrained joints. The index lists the terms, symbols, and clauses that are used throughout the code, as well as the references to other standards and publications. We also offer High Definition Plasma Cutting for custom shapes. This is used further to. Laser and Plasma Cutting. Why is Hydrogen a Concern in Welding? Welding Precautions for T-1 Steels. 95% carbon. harbor freight tig welder . , U. I've broke a couple 5/32 pilot drill bits and had to resharpen my dewalt black oxide bits every 2 or 3 holes now. AR400F is produced through austentizing, water quenching, and tempering. Excellent resistance to both impact and sliding abrasion at a moderate cost. Fullmetal tv . This can make it more. Our ABREX 400 wear plates have a uniform thickness that guarantees an excellent surface finish. Over 2” 200-250F. Most AR400 manufacturers specify generic 7018 welding rods, confirming their plate has little alloy content. I just finished a job using Hardox AR plate. We have warehouses in IL/CA/IN/OK/OH with large on-hand inventory. 1-800-745-3962 [email protected. Edge RetentionI am going to put some new steel targets on my 10 shot KD trailer. challenge no. cnc plasma cutter. To be classified as AR500, the hardness needs to clock in between 477 BHN and 550 BHN. This is because Chrome Carbide welding wires simply didn’t run out of. COMMONLY STOCKED SIZES. I got my hands on a piece of AR400 steel. 8500. AR400, or AR400F. use inter-pass temp control. Typical hardness range is 385/425 BHN. Grade 309 stainless steel can be welded using fusion or resistance welding methods. This means that 1055 carbon steel contains 0. TOP. In lower Hardox grades (up to 500), the hardness is combined with a great toughness, which ensures. For instance, you can use AR400 to attach to digging blades and others of the like. The base steel around the weld rapidly heats and cools during welding, resulting in a heat affected zone (HAZ) with high hardness. The versatility of AR400 steel plates come from its hardness and overall flexibility. AR400 is a quench and tempered steel and may be difficult to weld due its high strength and hardenability. I'm going to have the teeth flame cut from 2" AR400 plate. Plate Rolling. AR400, or AR400F steel, is a. #1. PROPERLY ANGLED STEEL The angle of the steel target makes a dramatic difference in the way that the splatter. AR400 is a quench and tempered steel and may be difficult to weld due its high strength and hardenability. Reply. bucket components, construction equipment and wear plates used in plows and farming equipment. Choose from our selection of hot-rolled steel, including over 4,000 products in a wide range of styles and sizes. 3% brings the best machinability rate. Differentiators include hardness levels, application uses, and cost. Grade 70 has the highest tensile strength of them all, between 485 – 625 MPa. 321. Steel Plate & Sheet Alro Steel Metals Guide ASTM A-514 Plate *This grade of steel may be susceptible to cracking in the heat-affected zone of welds during post-weld heat treatment (stress relief). T1 tool steel welding can be difficult due to its high carbon content. (51) HSS Endmills. Innershield® NR®-311 from Lincoln Electric is designed for high deposition rates and fast travel speeds. gas tungsten arc welding aluminum. (Stick welding is preferred simply because of the tendency of the semi-automatic process to apply too great of a deposit. Ar500 Price Per Square Foot is USD 2. This high-strength, quench and tempered alloy steel is perfect for heavy vehicle parts, construction and repairs. The QC manager is asking what to weld it with and how to do his PQR /WPS to satisfy the AI. Pre heat and control interpass. 321. This can make it more. 4140 steel properties. That’s an increase in hardness of 30%. The right filler metal and proper preheating can help reduce crack sensitivity with AR plate. This Standard applies to the welding of base metals 3 mm (1/8 in) and thicker. There were 8 of them 2-1/2" thick, and 8 more that were 1" thick. AR400 F Steel Plate is formable grade of Abrasive Resistance Steel Plate designed to accommodate applications where a life of wear is the primary cause for failure among other grades of steel plate. Tweet. on-premise software solutions, CAD file management, compliance, and more. We are your Vancouver and Western Canada metal supplier for 304 stainless steel, 316 stainless steel, A36 carbon, 1018 carbon, AR400 carbon, 3003 aluminum or 6061. The manufacturer warns not to heat the steel over 250 deg C after heat treatment. Thanks for every one's help. Hardox ® 450 has been setting the benchmark for quality steel for more than 30 years, for good reason. Quench the material in light oil heated to 150F. AR400 = 400 brinell harness . Hardness range of this formable wear material is 400-440 BHN. #3. 48″, 60″, 96″, 120″. Our "weld test" was merely to verify the preheat was high enough that the weld would break in the throat before a "chunk" would pull out of the base metal. . Tensalloy™ AR500 steel is a grade of abrasion resistant steel plate that offers outstanding wear and impact resistance. W59, W59. Wear Resistance = Great. AR500 Steel. bracket for an exhaust pipe, add Vanadium and increase the carbon a bit; there was a grade for that, 6150. . a. Generally speaking steel mills name their AR plate as follows. Summary. #3. Specifications. This may be necessary to avoid cracking of the weld metal or heat affected zone. I have a question though, I have a grapple for a Skidsteer that needs rebuilding, new pins and bushings and a new claw on one side. I use it for my pistol targets I usually get the stuff for about $. FormingRepairing Hydraulic Pipe on Excavator MIG Welding Forum. The material is through hardened, not surface hardened. Hardox ® 400 is a trusted steel in the Hardox ® wear plate family, with a heritage of hardness and toughness going all the way back to 1974, when Hardox ® was launched as the world’s first bendable wear steel. At Clifton Steel, we’ve had a long history of providing innovative solutions and being a one-stop shop. Manganese steel is a steel alloy containing 11-14% manganese. For multi-pass welds. View Profile View Forum Posts Find Started Threads; WeldingWeb Foreman Join Date Dec 2006 Location Southern New Hampshire Posts 919 Post Thanks / Like. Welding Stress Calculations4140 steel is a low alloy steel plate. Strip down and drench yourself in used motor oil. Directions. This will need to be completely rebuilt with AR400 or Wearox down the road and I will have to budget for it. I usually work with 1" and above, and use mist. This is an abrasion resistant, “thru-hardened”, alloy plate (AR400) product. It is also silicon killed, but has a finer grain and improved notched toughness. The need for preheat increases with steel thickness, weld restraint, the carbon/alloy content. The cushioning quality of this base metal allows it to absorb impact. However, they differ in terms of hardness. Due to A588’s specific coloring, you will need to consider color matching when welding. I've broke a couple 5/32 pilot drill bits and had to resharpen my dewalt black oxide bits every 2 or 3 holes now. Typical hardness range is 400/440BHN. Intended for moderate wear applications, common uses include contact. These bucket bosses are 2-1/2" thick AR400, and have M12-1. 1:2020 contains the requirements for fabricating and erecting welded steel structures. ASTM A514 is the standard specification for high yield, quenched and tempered alloy steel plate, suitable for welding. Recommended for: liners for mining and material. Gun Weld Packs.