Alloy Steel Plates

Chromoly is an abbreviation for "chromium-molybdenum steel". Chromoly is an alloy used to produce tubing for bicycle frames and race-car roll cages. It is not as lightweight as some steel alloys, but has the advantages of high tensile strength and malleability. It is also easily welded and is considerably stronger and more durable than standard (1020) steel tubing.


Chemical Composition of Sheets/ Plates
ASTM Grade C max Mn max P max S max Si max Ni Cr Mo Others
A387 Class 1 Class 2 5 0.15 0.30-0.60 0.04 0.03 0.5
4.00-6.00 0.45-0.65

9 0.15 0.30-3.60 0.03 0.3 1
8.00-10.0 0.90-1.10

11 0.04-0.17 0.40-0.65 0.04 0.04 0.50-0.80
1.00-1.50 0.45-0.65

12 0.04-0.17 0.40-0.65 0.04 0.04 0.15-0.40
0.80-1.15 0.45-0.60

22 0.05-0.17 0.30-0.60 0.04 0.035 0.5
2.00-2.50 0.90-1.10


Mechanical Requirements Hardness
ASTM Grade Tensile Strength Apa (ksi) min Yield Strength Mpa (ksi)min
Elongation min% Brinel max HB Rockwell max HRB


Class 1 Class 2 Class1 Class2


A387 Class 1 Class 2 5 415-585 515-690 205 310 18 202 92
9 415-585 515-690 205 310 18 217 95
11 415-585 515-690 240 310 22 217 95
12 380-550 450-585 230 275 22 217 95
22 415-585 515-690 205 310 18 201 92

Alloy Steel Plates

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