Factory Supply High Purity Alloy Plate
| Brand | C | Si | Mn | P | S | V | Nb | Al | Ti |
| Q345A | ≤0.20 | ≤0.55 | 1.00-1.60 | ≤0.045 | ≤0.045 | 0.02-0.15 | 0.015-0.060 | 0.02-0.20 | |
| Q345B | ≤0.20 | ≤0.55 | 1.00-1.60 | ≤0.040 | ≤0.040 | 0.02-0.15 | 0.015-0.060 | 0.02-0.20 | |
| Q345C | ≤0.20 | ≤0.55 | 1.00-1.60 | ≤0.035 | ≤0.035 | 0.02-0.15 | 0.015-0.060 | ≥0.015 | 0.02-0.20 |
| Q345D | ≤0.18 | ≤0.55 | 1.00-1.60 | ≤0.030 | ≤0.030 | 0.02-0.15 | 0.015-0.060 | ≥0.015 | 0.02-0.20 |
| Brand | Mechanical properties | ||||
| 12Mn2A | Thickness ≤ 4mm steel plate | Thickness ＞4mm steel plate | Brinell hardness HBW No greater than | ||
| Tensile strength Rm N/m ㎡ | Elongation after break A11.3% Not less than | Tensile strength Rm N/m ㎡ | Elongation after break A11.3% Not less than | ||
| 12Mn2A | 390-570 | 22 | 390-570 | 23 | ---- |
| 45Mn2A | 590-835 | 12 | 590-835 | 13 | - - |
| 20CrA | 390-590 | 18 | 390-590 | 20 | |
| 38CrA | 540-735 | 16 | 540-735 | 18 | ---- |
| 40CrA | 540-735 | 14 | 540-730 | 16 | -- |
| 20CrMnSiA | 490-685 | 18 | 490-685 | 21 | -- |
| 25CrMnSiA | 570-720 | 18 | 570-720 | 20 | 229 |
| 30CrMnSiA | 540-735 | 16 | 540-735 | 19 | 229 |
| 35CrMnSiA | 590-785 | 14 | 590-785 | 16 | - |
| 18CrMn2MoBA | 440-640 | 20 | 440-640 | 22 | 217 |
| 30CrSiMoVA | QQ709023242 | - | - | - | 217 |
According to the professional use, there are plates for oil drums, enamel plates, bullet-proof plates, etc.; according to the surface coating layer, there are galvanized thin plates, tin-plated thin plates, lead-plated thin plates, plastic composite steel plates, etc.
1. Classification by thickness: (1) thin plate; (2) medium plate; (3) thick plate; (4) extra thick plate.
2. Classification by production method: (1) hot-rolled steel sheet; (2) cold-rolled steel sheet.
3. Classification by surface characteristics: (1) galvanized sheet (hot dip galvanized sheet, electro galvanized sheet); (2) tin-plated sheet; (3) composite steel sheet; (4) color coated steel sheet.
4. Classification by application: (1) Bridge steel plate; (2) Boiler steel plate; (3) Shipbuilding steel plate; (4) Armor steel plate; (5) Automobile steel plate; (6) Roofing steel plate; (7) Structural steel plate; (8) Electrical steel plate (silicon steel sheet); (9) Spring steel plate; (10) Other common Japanese grades of steel plates for general and mechanical structures.
