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ASTM A572-07 High-Strength Low-Alloy Columbium-Vanadium Structural Steel
USI mainly provide flat steel (HRC, HR Plate, CRC, GI, GL,PPGI, etc.), long steel (billet, deformed bar, wire rod, round bar, pipe, etc.) and special steel (high- tensile steel & stainless steel) to end consumers、distributors & trading houses in the world.
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ASTM A572-07 High-Strength Low-Alloy Columbium-Vanadium Structural Steel
| Grade | Thickness | Chemical Compositions % | Tension Test | ||||||||||||
| C | Si | Mn | P | S | Type 1 | Type 2 | Type 3 |
Yield Point ksi (N/mm²) |
Tensile Strength ksi (N/mm²) |
Elongation | |||||
| Nb | V | Nb | V | Nb+V |
Test piece in(mm) |
% min |
|||||||||
| Gr.42 | t≤38.1 | 0.21 Max | 0.40 Max | 1.35 Max | 0.040 Max | 0.050 Max |
0.005 - 0.050 |
0.01 - 0.15 |
0.005 - 0.050 |
0.01 - 0.15 |
0.02 - 0.15 |
42(290) min |
60(415) min |
GL=8(200) GL=2(50) |
20 24 |
| t>38.1 | 0.15-0.40 | ||||||||||||||
| Gr.50 | t≤38.1 | 0.23 Max | 0.40 Max |
50(345) min |
65(450) min |
GL=8(200) GL=2(50) |
18 21 |
||||||||
| t>38.1 | 0.15-0.40 | ||||||||||||||
| Gr.55 | t≤38.1 | 0.25 Max | 0.40 Max |
55(380) min |
70(485) min |
GL=8(200) GL=2(50) |
17 20 |
||||||||
| t>38.1 | 0.15-0.40 | ||||||||||||||
| Gr.60 | t≤31.80 | 0.26 Max | 0.40 Max |
60(415) min |
75(520) min |
GL=8(200) GL=2(50 |
16 18 |
||||||||
| Gr.65 | t≤12.70 | 0.26 Max | 0.40 Max | 1.35 Max |
65(450) min |
80(550) min |
GL=8(200) GL=2(50) |
15 17 |
|||||||
| t>12.70 | 0.23 Max | 1.65 Max | |||||||||||||
Remarks
1.When copper steel is specified, minimum Cu shall be 0.20%.
2. Manganese, minimum by heat analysis of 0.80% shall be required for all plates over 3/8 in.(9.53mm) in thickness, a minimum of 0.50% shall be required for plates 3/8 in.(9.53mm) and less in thickness, and for all other products. The manganese to carbon ratio shall not be less than 2 to1.
3. Gr.42,50,55,60 for each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum is permitted, up to a maximum of 1.60%.
4. Gr.65 if the thickness is 12.70mm or under, an alternative chemical requirement with a maximum carbon of 0.21% and a maximum manganese of 1.65% is permitted.
5. For plates wider than 24 in.(600mm), the elongation requirement is reduced two percentage points for Grades 42,50 and 55, and three percentage points for Grades 60 and 65. See elongation requirement adjustments in the Tension Tests section of Specification A6/A6M.
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