MS carbon steel pipe standard length erw welded carbon steel round pipe and tubes
Q345 steel is a Chinese GB standard Low Alloy High Strength Structural Steel, material density is 7.85 g/cm3, tensile strength is 470-630 Mpa, and yield strength is 345 MPa, it has better properties than Q235. According to GB/T 1591 – 2008, Q345 material has 5 quality grades: Q345A, Q345B, Q345C, Q345D and Q345E.
Q345 steel has good weldability, cold & hot workability and corrosion resistance. Widely used in bridges, ships, boilers, pressure vessels, petroleum storage tanks, lifting transport machinery and other high-load welded structural parts.
Meaning & Designation
“Q” is the first letter of Chinese Pinyin: “qu fu dian”, that means Yield Point, “345” is the minimum value of yield strength 345 MPa for steel thickness ≤16mm.
Chemical Composition:
| | Chemical Composition Content (≤%) |
| Steel Grade | Quality Grade | C | Si | Mn | P | S | Cr | Ni | Mo | Cu | Ti | N | Nb | V | B | Als, ≥ |
| Q345 | Q345A | 0.20 | 0.50 | 1.70 | 0.035 | 0.035 | 0.30 | 0.50 | 0.10 | 0.30 | 0.20 | 0.012 | 0.07 | 0.15 | – | – |
| Q345B | 0.035 | 0.035 |
| Q345C | 0.030 | 0.030 | 0.015 |
| Q345D | 0.18 | 0.030 | 0.025 |
| Q345E | 0.025 | 0.020 |
Mechanical Property:
| | | Mechanical Properties: Yield Strength (≥ MPa) |
| Steel Grade | Quality Grade | d ≤16 | 16< d ≤ 40 | 40<d ≤ 63 | 63<d≤ 80 | 80 < d ≤ 100 | 100 < d ≤ 150 | 150 < d ≤ 200 | 200 < d ≤ 250 | 250 < d ≤ 400 |
| Q345 | Q345A | 345 | 335 | 325 | 315 | 305 | 285 | 275 | 265 | – |
| Q345B |
| Q345C |
| Q345D | 265 |
| Q345E |
| Low Alloy Structural Steel Q345 Equivalent |
| China | US | Germany | Japanese | ISO | |
| Standard | Grade | Standard | Standard | Grade (steel number) | Standard | Grade | Standard | Grade | |
| GB/T 1591 – 2008 (Year) | Q345A | ASTM A529 Grade 50;
ASTM A572 Grade 50;
ASTM A588 Grade 50;
ASTM A678 Grade 50 | | | JIS G3135 | SPFC590 | ISO 630-2 | S355C, S355D (S355) | |
| GB/T 1591 – 2008 | Q345B | DIN EN 10025-2;
DIN 17100 | S355, S355JR (1.0045),
E355 (1.0060);
St52-3 | JIS G3135 | SPFC 590 | ISO 630-2 | S355C, S355D (S355) | |
| GB1591 – 2008 | Q345C | DIN EN 10025-2;
DIN 17100 | S355J0 (1.0553),
E335 (1.0060);
St52-3 | JIS G 3135 | SPFC590 | ISO 630-2 | S355D (S355) | |
| GB 1591 – 2008 | Q345D | ASTM A656 Grade 50;
ASTM A529 Grade 50 | DIN EN 10025-2;
DIN EN 10025: 1993;
DIN 17100 | S355J0 (1.0553),
E335 (1.0060);
S355J2G3 (1.0570);
St52-3 | JIS G 3135 | SPFC590 | ISO 630-2 | S355D (S355) | |
| GB/T 1591 – 2008 | Q345E | ASTM A656/A656M Grade 50;
ASTM A529/A529M Grade 50;
ASTM A808 Grade 50 | DIN EN 10025-2;
DIN EN 10025: 1993 | S355J2 (1.0553),
S355K2 (1.0596),
E335 (1.0060);
S355J2G4 (1.0577),
S355K2G3 (1.0595),
S355K2G4 (1.0596) | JIS G3135 | SPFC 590 | | |
Payment Terms
1.Payment: T/T, L/C, Western Union, MoneyGram,PayPal; 30% deposits; 70% balance before delivery.
2.MOQ: 1pcs
3.Warranty : 3 years
4.Package Informations: 1) EXPORT, In 20 feet (GW 25 ton) or 40 feet Container (GW 25 ton)
2)as customer's requirement
Why choose us?
(1) The leading exporter in China special steel industry.
(2) Large stocks for various sizes, fast delivery date.
(3) Good business relationship with China famous factories.
(4) More than 7 years steel exporting experience.
(5) Good after-sales service guarantee.
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