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LADHANI METAL CORPORATION, MUMBAI, INDIA
Q690 steel and Q690M material is a Chinese GB standard high strength low alloy structural steel, and devides into 3 quality grades: Q690C, Q690D and Q690E, “Q” means Yield Strength, “690” refers to 690 Mpa, Tensile Strength is 770-940 Mpa, “M” is short for “TMCP” (Thermal Mechanical Control Processing), for data sheet and specification, please refer to the following tables.
Steel plates made from Q690 material has high yield strength and tensile strength and is widely used in coal mine machinery and engineering machinery, such as hydraulic support, port cranes, flatbed trucks and so on.
Q690 Steel Chemical Composition
The chemical compositon of Q690C, Q690D, Q690E are displayed in the following table.
| Q690 Chemical Composition (%) | ||||||||||||||||
| Steel Grade | Quality Grade | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | B | Al |
| Q690 | Q690C | ≤ 0.18 | ≤ 0.60 | ≤ 2.00 | ≤0.030 | ≤0.030 | ≤ 0.11 | ≤ 0.12 | ≤ 0.20 | ≤ 1.00 | ≤ 0.80 | ≤ 0.80 | ≤ 0.015 | ≤ 0.30 | ≤ 0.004 | ≥ 0.015 |
| Q690D | ≤0.030 | ≤0.025 | ||||||||||||||
| Q690E | ≤0.025 | ≤0.020 | ||||||||||||||
Q690 Carbon Equivalent Value (CEV): ≤0.49% (including C, D, E; all diameter)
Q690 Steel Mechanical Properties
| Q690 Yield Strength (≥N/mm2); Thickness or Dia. d (mm) | ||||||
| Standard | Steel Grade | Quality | d≤16 | 16<d≤40 | 40<d≤63 | 63<d≤80 |
| GB/T 1591 – 2008 | Q690 | C, D, E | 690 | 670 | 660 | 640 |
| GB/T 1591 – 2018 | Q690M | C, D, E | 690 | 680 | 670 | 650 |
| Q690 Tensile Strength (N/mm2); d (mm) | Elongation | |||||
| Standard | Steel Grade | Quality | d≤40 | 40<d≤63 | 63<d≤80 | % |
| GB/T 1591 – 2008 | Q690 | C, D, E | 770-940 | 750-920 | 730-900 | ≥14 |
| GB/T 1591 – 2018 | Q690M | C, D, E | 770-940 | 750-920 | 730-900 | ≥14 |
1 Mpa= 1N/mm2
Q690M: “M” means TMCP (Thermal Mechanical Control Processing)
Welding crack sensitivity index (Pcm): ≤0.25% (Only for bars)
Charpy Impact Test of Q690 Material
| Charpy Impact Test (V) – Test temperature and impact absorbed energy | ||||
| Grade | Quality Grade | Test Temp. (℃) | Thickness | Absorbed Energy (KV2/J) |
| Q690 steel | Q690C | 0 | 12mm-150mm | ≥55 |
| Q690D | -20 | ≥47 | ||
| Q690E | -40 | ≥31 | ||
| Impact test to take longitudinal samples. | ||||
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