Q345 steel Specification and Description
Q345 steel belongs to 16Mn steel grade, usually it is produced in hot rolled state, hot rolled steel plate, hot rolled steel coil/sheet, it has comprehensive mechanical and welding property, as it shows good performance in structural purposes, it is widely used as welding structural part in manufacturing of ship, railway and vehicles, bridges, boiler, pressure vessel container, steel oil tank, etc. Yield point of Q345 steel plate decreases as plate thickness increases.
Q345 Steel Chemical Composition:
| Steel Standard | Steel Grade | Chemical Composition |
| C≤ | Mn | Si≤ | P≤ | S≤ | V | Nb | Ti | Al≥ |
| Q345 | A | 0.20 | 1.00~1.60 | 0.55 | 0.045 | 0.045 | 0.02~0.15 | 0.015~0.060 | 0.20 | - |
| B | 0.20 | 1.00~1.60 | 0.55 | 0.040 | 0.040 | 0.02~0.15 | 0.015~0.060 | 0.20 | - |
| C | 0.20 | 1.00~1.60 | 0.55 | 0.035 | 0.035 | 0.02~0.15 | 0.015~0.060 | 0.20 | 0.015 |
| D | 0.20 | 1.00~1.60 | 0.55 | 0.030 | 0.030 | 0.02~0.15 | 0.015~0.060 | 0.20 | 0.015 |
| E | 0.20 | 1.00~1.60 | 0.55 | 0.025 | 0.025 | 0.02~0.15 | 0.015~0.060 | 0.20 | 0.015 |
Mechenical Property Comparision of Q345/Q235/S355:
| Steel Grade | Tensile strength | Yield strength | Elongation afrer fracture |
| S355 | 450-630Mpa | ≥355MPa | 21-22% |
| S500MC | 550-700Mpa | ≥500MPa | ≥12% |
| Q345B | 490-675Mpa | ≥345Mpa | ≥21% |
| Q235B | 375-500Mpa | ≥235Mpa | ≥26% |
Chemical Composition Comparision of Q345/Q235/S355:
| Steel Grade | C | Si | Mn | P | S |
| S355 | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.025 |
| S500MC | ≤0.12 | ≤0.50 | ≤1.70 | ≤0.025 | ≤0.015 |
| Q345B | ≤0.20 | ≤0.50 | ≤1.70 | ≤0.035 | ≤0.035 |
| Q235B | ≤0.20 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.045 |
Q345 Steel Equivalent Standard(ASTM/EN/JIS):
| Steel for boiler and other pressure vessels | GB 713-2008
ASTM A537-08
JIS G3115 | Q245R (20g/20R); Q345R (16Mng/16MnR)
Class 1/2/3
SPV235; SPV315; SPV355 |
| High strength low alloy structural steel | GB/T 1591-2008
EN 10028-3-2003
EN 10025-2004
ASTM A572-07
ASTM A588-05 | Q345 (A/B/C/D/E); Q390; Q420
P355N
S420N
Grade 50; Grade 60
Grade A; Grade B |
General Q and A Questions
Q: Would you provide samples For free?
A: Yes. with on stock specification We provide samples For Free. Freight charge collect
Q: What information should i provide to source for the right products?
A: Material grade, width, thickness, coating and Purchase quantity, Expected lead time, etc
Q: What are the shipping ports?
A: Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you
can choose other ports according to your needs.
Q: About product prices?
A: Prices vary from period to period due to cyclical changes in the price of raw materials.
Q: How long does your delivery time take?
A: In general, our delivery time is within 5-45 days, and may be delayed if the demand is extremely
large or special circumstances occur.
Q: Can I visit your location?
A: Of course, we welcome customers from all over the world to visit our factory. However, some
of the plants are not open to the public.
Q: Does the product have quality inspection before loading?
A: Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed. We provide All Original Mill test certificate and support third party inspection.
Q: How to pack the products?
A: The inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation
wooden pallet. It can effectively protect products from corrosion during ocean transportation.
Q: What is your working time?
A: In general, our online service time is Beijing time: 8:00-22:00, after 22:00,
we will reply to your inquiry during the next working day.
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