Chemical composition and mechanical properties of Q400GMDR, a Chinese grade of cryogenic pressure vessel steel.
Q400GMDR Approximate Grade Lookup Table
Q400GMDR Chemical Composition
| Grade | Chemical Composition(Quality Fraction)/% | ||||||||
| C | Si | Mn | P | S | Cr | Cu | B | N | |
| Q400GMDR | 0.35- 0.55 |
0.10- 0.50 |
22.5- 25.5 |
≤0.0200 | ≤0.0050 | 3.00- 4.00 |
0.30- 0.70 |
≤0.0050 | ≤ 0.0500 |
Q400GMDR Mechanical properties and processing properties
| Grade | Transverse room temperature tensile test | Transverse Charpy (V-notch) impact test | 180°Bending test b=2a | ||||
| Specified plastic elongation strength Rp0.2/MPa |
Tensile strengthRm/MPa | Elongation after fractureA/% | Test temperature/℃ | Absorb energyKV₂/J | Lateral expansion value LE/mm | ||
| Q400GMDR | ≥400 | 800～950 | ≥35 | -196 | ≥60 | ≥0.53 | D=3a |
Note: D is the diameter of the bending indenter, a is the sample thickness, and b is the sample width.