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Plate Steel and Ratings
Plate Steel and Ratings
Dont be fooled
Published by Rock4XFab
01-14-2008
Plate Steel and Ratings

I have seen over the last year many people refer to plate steel as being A-50 and that there brackets and or tabs are made from them.. While this is a sales tactic to the unknowing indavidual thinking WOW it must be better!!! Well I am here to tell you there is NO SUCH ANIMAL..Well at least since 1937 when the rating was pulled. And even then it was not a rating for plate but a rating for quenched carbon steel Track bolts..

Based on ASTM standards these are your most common..Plate ratings you will use. There are many more but I will start with these.
No where is A-50 a standard by ASTM.. There is a grade 50 but you can get Grade 50 even with A-36 so myth debunked dont get fooled by someone who probably knows even less then you but needs to spout Crap
Sheet and Plate

1045
Typical Applications

1045 hot roll plate has a wide variety of applications. It is used for machinery parts, excellent for die forging and hot upsetting, gears, bolster plates, base plates, wear plates, brake dies etc. 1045 hot roll plate can be flame cut to various shapes for a multitude of uses, both in the hardened or annealed condition. Can be hammer forged. 1045 can be used where greater strength is required than can be obtained from the lower carbon steels. It responds to heat treatment, and a wide range of properties can be obtained. In thicker sections, partial hardening increases strength substantially, and flame or induction hardening produces a high surface hardness.

Grade: 1045

Finish: Hot Rolled

C1045 hot roll plate is a silicon killed medium carbon steel. In the as-rolled condition, higher carbon content imparts increased strength over low carbon steels, such as 1018. 1045 hot roll plate is often stress relieved, normalized, or annealed after burning shapes to size to allow for easier machining. Response to heat treatment is excellent and the resultant mechanical properties which can be obtained permit wide usage in the production of machinery parts and shafts. Parts made from 1045 hot roll plate can be hammer forged, heat treated for further durability, or used in the non-heat-treated condition. Machinability is good, but forming and welding qualities are limited.

ANALYSIS
Carbon (C) Manganese (Mn) Phosphorus (P)Sulfur (S)
0.42-0.5 0.6-0.9 0.04 0.05


1045 hot roll plate conforms to ASTM A830

MECHANICAL PROPERTIES
Condition Tensile Strength (PSI) Yield Strength (PSI) Reduction of Area Elongation in 2" Brinell Hardness
As-Rolled 95,000 56,000 44 21 207

The above values are average and may be considered as representative of 1045 hot roll plate

APPLICATIONS
1045 hot roll plate has a wide variety of applications. It is used for machinery parts, excellent for die forging and hot upsetting, gears, bolster plates, base plates, wear plates, brake dies etc. 1045 hot roll plate can be flame cut to various shapes for a multitude of uses, both in the hardened or annealed condition. Can be hammer forged. 1045 can be used where greater strength is required than can be obtained from the lower carbon steels. It responds to heat treatment, and a wide range of properties can be obtained. In thicker sections, partial hardening increases strength substantially, and flame or induction hardening produces a high surface hardness.

MACHINEABILITY AND WELDABILITY
Machinability is rated at 64% of B1112. Average cutting speed 95 ft/min. 1045 is not readily welded, due to its higher carbon content. On thin sections, arc or gas welding can be used without preheating, but in welds and joints on thicker sections, preheating is necessary. Stress relieving after welding is also recommended.

HEAT TREATING
1045 is a water or oil quenched metal. The recommended quenching temperatures are 1550° F for water and 1575° F for oil. A wide range of mechanical properties can be obtained by tempering at different temperatured between 700° F and 1300° F Tempering below 700° F should be avoided. 1045 can be flame or induction hardened, but not recommended for carburizing or cyaniding treatments.
Normalizing: 1600° - 1700° F
Annealing: 1400° - 1500° F
Hardening: 1475° - 1550° F

A-36
Typical Applications

ASTM A36 is used for general purpose structural, machinery parts, frames, fixtures, automotive and agricultural implements and equipment, brackets, stakes, ornamental works, forgings, base plates, gears, cams, sprockets, jigs, rings, templates, fixtures, bearing plates, tanks, bins, various parts obtained by flame cutting, and miscellaneous non-critical applications that involve mild cold bending, mild hot forming, punching, machining, and welding.

Grade: A-36

Finish: Hot Rolled

ASTM A36 A basic oxygen process steel, ASTM A36 has good forming and welding ability, and can be hardened within its carbon limitations. Generally supplied flame cut to size (BTS) or flame cut to print shape (BPP), it can be sheared easily in thin thicknesses, typically ΒΌ" thick and smaller. Stress relieving is recommended prior to machining if dimensional stability or specific flatness tolerances are required.

ANALYSIS

Thickness Carbon (C) Manganese (Mn) Phosphorus (P) Sulfur (S)
3/4" and under 0.25 Trace 0.04 0.04
Over 1-1/2" to 2-1/2" 0.26 0.8-1.2 0.04 0.05
Over 2-1/2" to 4" 0.27 0.85-1.2 0.04 0.05
Over 3/4" to 1-1/2" 0.25 0.8-1.2 0.04 0.05
Over 4 0.29 0.85-1.2 0.04 0.05

MECHANICAL PROPERTIES

Condition ASTM A36 Tensile Strength (PSI) 58,000-80,000 Yield Strength (PSI) 36,000 Reduction of Area 60Elongation in 2 30" Brinell Hardness 149

ASTM A36 is used for general purpose structural, machinery parts, frames, fixtures, automotive and agricultural implements and equipment, brackets, stakes, ornamental works, forgings, base plates, gears, cams, sprockets, jigs, rings, templates, fixtures, bearing plates, tanks, bins, various parts obtained by flame cutting, and miscellaneous non-critical applications that involve mild cold bending, mild hot forming, punching, machining, and welding.

MACHINEABILITY AND WELDABILITY

ASTM A36 has a machinability rating of 72%, based on 1212 at 100%. Average surface cutting feed 120 ft/min. ASTM A36 plate is easily welded by all welding processes and the welds and joints produced are of extremely high quality.

HEAT TREATING
ASTM A36 will respond to any of the standard carburizing and subsequent hardening methods used for such grades as 1018.
Normalize 1650-1750F Anneal 1550-1600F Stress Relieve 1250-1700F Carburize 1650-1700F Harden 1450-1500F


ASTM A572


ASTM A572 Grade 50 is considered a "workhorse" grade and is widely used in many applications. Steel mills produce channel and heavy beams with Grade 50. It is commonly used in structural applications, heavy construction equipment, building structures, heavy duty anchoring systems, truck frames, poles, liners, conveyors, boom sections, structural steel shapes, and applications that require high strength per weight ratio.

Grade: Grade 50

Finish: Hot Rolled

Grade 50 is a high strength, low alloy steel that finds its best application where there is need for more strength per unit of weight. Less of this material is needed to fulfill given strength requirements than is necessary with regular carbon steels. Grade 50 is used in general plate applications when the plate will be riveted, bolted, or welded. Grade 50 is a Columbium-Vanadium steel that offers a minimum yield of 50,000 PSI. In addition, ASTM A572 Grade 50 is noted for its increased resistance to atmospheric corrosion. Grade 50 contains more alloying elements than plain carbon steel and thus is somewhat more difficult to form. Grade 50 is more difficult to cold work, but can be successfully bent or shaped but requires more force than plain carbon steel
ANALYSIS
Carbon (C) 0.23 Manganese 1.35 (Mn) Silicon (Si) 0.15-0.4 Vanadium (V) 0.01-0.05 Niobium (Nb) 0.005-0.05 Phosphorus (P)0.04 Sulfur (S) 0.05

Up to 1-1/2" the below number apply
0.23, 1.35, 0.4, 0.01-0.05, 0.005-0.05, 0.04, 0.05

MECHANICAL PROPERTIES


Tensile Strength (PSI) Yield Strength (PSI) Elongation in 2" Brinell Hardness
65,000, 50,000 ,19 ,135

The above values are average and may be considered as representative of ASTM A572 Grade 50 Elongation in 8": 16%

APPLICATIONS
ASTM A572 Grade 50 is considered a "workhorse" grade and is widely used in many applications. Steel mills produce channel and heavy beams with Grade 50. It is commonly used in structural applications, heavy construction equipment, building structures, heavy duty anchoring systems, truck frames, poles, liners, conveyors, boom sections, structural steel shapes, and applications that require high strength per weight ratio.

MACHINEABILITY AND WELDABILITY
Machinability is rated at 66% of B1112. Average cutting speed 110 ft/min. Easily welded by all commercial methods.

HEAT TREATING
Grade 50 is generally used in the "as supplied" condition. Annealing, if required, can be done at 1700° F and slow furnace cooled
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  #1  
By SlightlyModified on 01-15-2008, 05:30 PM
Keep in mind when purchasing steel that some ASTM grades have non mandatory Physical properties. The spec. will list a range of properties for expectations. These expected ranges aren't met a lot of times.
At my real job of Mechanical and Chemical steel testing, I also do a lot of material grading...........
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  #2  
By Rock4XFab on 01-16-2008, 02:28 AM
Yes you are correct they are not always meet. Everything I purchace has a cert. so I know what we purchace. The issue I had is seeing a few vendors using the A-50 Rating when there is NO such thing. It just burns my ass that some guy throws out a number or ficticuos opinion and other vendors pick up on it and they themselves 1) have no clue about what they are talking about and 2) then babble it like it is the best thing since sliced bread. The internet is a great tool but there are way to many people regurgitating BULLSHIT lately.
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  #3  
By Rock4XFab on 03-25-2008, 11:28 PM
These people are till spouting BLAHHHHH
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