|
Still deciding? Get samples of $ !
Request Sample
|
| Warranty: | 1year |
|---|---|
| Type: | Seamless |
| Technique: | Hot Rolled |
Suppliers with verified business licenses
Audited Supplier Audited by an independent third-party inspection agency
Q345E steel pipe is a premium Chinese standard (GB) high-strength low-alloy (HSLA) seamless/welded pipe designed for low-temperature service down to -40°C. The designation "Q345E" carries specific meaning:
| Standard | Application | Key Requirements |
| GB/T 1591-2018 | Base material standard for Q345E steel | Chemical composition, mechanical properties, impact testing |
| GB/T 8163-2018 | Seamless steel pipe for fluid transport | Dimensional tolerance, hydrostatic testing, surface quality |
| GB/T 6479-2013 | High-pressure /seamless steel pipe for chemical industry | Higher pressure rating, stricter non-destructive testing |
| GB/T 9711-2017 | Steel pipe for oil and gas transportation | Pipeline-specific requirements, toughness criteria |
| Element | Content Range | Purpose |
| Carbon (C) | ≤0.18% | Controlled for weldability and low-temperature toughness |
| Manganese (Mn) | 1.00-1.60% | Primary strengthening element, improves toughness |
| Silicon (Si) | ≤0.55% | Deoxidizer, enhances strength without impairing ductility |
| Phosphorus (P) | ≤0.025% | Strictly limited to prevent cold brittleness |
| Sulfur (S) | ≤0.020% | Minimized to reduce hot cracking and improve toughness |
| Niobium (Nb) | 0.015-0.060% | Grain refinement, precipitation strengthening |
| Vanadium (V) | 0.020-0.150% | Grain refinement, improves strength and toughness |
| Titanium (Ti) | ≤0.20% | Optional microalloying for additional grain refinement |
| Chromium (Cr) | ≤0.30% | Optional for corrosion resistance enhancement |
| Nickel (Ni) | ≤0.50% | Optional for improved low-temperature toughness |
| Property | Value | Notes |
| Yield Strength (σs) | ≥345 MPa (for ≤16mm wall)≥335 MPa (16-40mm)≥325 MPa (40-63mm)≥295 MPa (>63mm) | Decreases with increasing wall thickness |
| Tensile Strength (σb) | 470-630 MPa | Higher than carbon steel (e.g., Q235: 370-500 MPa) |
| Elongation (δ) | ≥21% | Ensures good ductility and deformability |
| Impact Energy (Akv) | ≥34 J at -40°C | Charpy V-notch test, critical for low-temperature applications |
| Brinell Hardness (HB) | ≤235 | Indicates good machinability |
| Standard | Equivalent Grade | Key Similarities |
| ASTM/ASME | A572 Gr.50, A656 Gr.50, A333 Gr.6 | Similar strength, -40°C impact requirement (A333 Gr.6) |
| EN/DIN | S355NL (1.0546), S355ML | S355NL matches -40°C impact, same yield strength |
| JIS | SM490YB, SPFC590 | High-strength low-alloy grades with good toughness |
| GOST | 10ChSND | Russian equivalent for low-temperature service |
Q1: Why choose us?
A: Our company, as an internationally experienced and professional supplier, has been engaged in steel business for more than ten years. We can provide a variety of steel products with high quality to our clients.
Q2: Can you provide OEM/ODM service?
A: Yes. Please feel free to contact us for more details.
Q3:What is your terms of payment?
A: 100% T/T advance.
30% T/T and balance against copy of documents.
30% T/T advance, balance L/C at sight.
Q4: Can we visit your factory?
A: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.
Q5: Can you provide sample?
A: Yes. Sample is free for regular sizes, but the buyer needs to pay freight cost.
Q6: How long is your delivery time?
A: Regular lead time is 15 to 30 days after receiving deposit.
){kind=link}