S355J0 steel pipe is a type of tubing manufactured from S355J0 non-alloy high-strength structural steel that complies with EN 10025-2 standard. It is widely used in engineering and machinery fields under the European standard system, and serves as one of the core products in the metal materials foreign trade sector targeting markets in Europe, Southeast Asia and beyond.
I. Core Executive Standards
S355J0 steel pipe must meet both the base material standards and pipe forming standards, which shall be clearly specified in foreign trade contracts:
Base Material Standard: EN 10025-2:2004 Technical delivery conditions for non-alloy structural steels - Hot rolled products - Part 2: Technical delivery conditions for non-alloy structural steels
Pipe Forming Standards
Hot-rolled seamless/welded steel pipes: EN 10210-1 (Suitable for load-bearing structures with high dimensional accuracy)
Cold-formed welded steel pipes: EN 10219-1 (Cost-effective, suitable for non-heavy-duty applications)
II. Core Interpretation of the Grade Designation
| Letter/Number |
Meaning |
| S |
Structural steel |
| 355 |
Minimum yield strength of 355 MPa (for thickness ≤ 16mm) |
| J0 |
Impact energy grade, with longitudinal impact energy ≥ 27 J at 0ºC (for unnotched specimens) |
III. Key Technical Parameters
1. Mechanical Properties (at room temperature, thickness ≤ 16mm)
| Performance Index |
Value |
Test Standard |
| Yield Strength (ReH) |
≥355 MPa |
EN ISO 6892-1 |
| Tensile Strength (Rm) |
470-630 MPa |
EN ISO 6892-1 |
| Elongation after Fracture (A5) |
≥21% |
EN ISO 6892-1 |
| Impact Energy at 0ºC (KV) |
≥27 J |
EN ISO 148-1 |
Foreign Trade Note: When the wall thickness of the steel pipe exceeds 16mm, the yield strength will decrease with the increase of thickness. The corresponding performance value for the specific thickness shall be indicated in the quotation.
2. Typical Chemical Composition (mass fraction, %)
| Element |
C |
Si |
Mn |
P |
S |
| Content Range |
≤0.20 |
≤0.55 |
≤1.60 |
≤0.030 |
≤0.030 |
IV. Common Specifications and Processing Methods
Processing Types
Seamless steel pipes: Hot-rolled, cold-drawn (Suitable for high-pressure and high-precision scenarios)
Welded steel pipes: Submerged Arc Welding (SAW), Electric Resistance Welding (ERW) (Suitable for large-diameter and low-cost scenarios)
Regular Size Range
Outer Diameter (OD): 10mm-1220mm
Wall Thickness (WT): 1.5mm-50mm
Length: Fixed length of 6m/12m, or customized as required
V. Main Application Fields
Building steel structure supports, beams and columns
Load-bearing components for bridge engineering
Construction machinery chassis and brackets
Fluid transmission pipelines (for non-corrosive medium)
Port and terminal heavy equipment frames
| 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 |
Mechanical Properties (GB/T 1591-2018)
| Property |
Value |
Notes |
| Yield Strength (σs) |
≥355 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 |
Low-Temperature Performance Advantage
The "D" grade designation signifies Q345D's exceptional resistance to brittle fracture at sub-zero temperatures:
· Successfully passes -40°C impact testing (vs. Q345D at -20°C, Q345C at 0°C)
· Microalloying with Nb/V/Ti creates a fine-grained ferrite-pearlite microstructure that enhances toughness
· Strict control of P/S impurities (≤0.025% P, ≤0.020% S) minimizes brittle phase formation
Manufacturing & Quality Control
Production Methods
Seamless: Hot rolling, cold drawing, or hot expansion processes ensuring uniform wall thickness and no longitudinal welds
Welded: ERW (Electric Resistance Welding) or SAW (Submerged Arc Welding) with proper heat treatment
Critical Quality Inspections
Chemical analysis: Verify alloy composition meets GB/T 1591-2018 requirements
Mechanical testing: Tensile, yield, elongation, and -40°C Charpy V-notch impact tests
Non-destructive testing (NDT):
Ultrasonic testing (UT) for internal defects
Eddy current testing (ECT) for surface defects
Hydrostatic pressure test (1.5× working pressure) for leak-tightness
Microstructure examination: Ensure fine-grained structure free of harmful phases
Applications
Q345E steel pipe is widely used in demanding low-temperature environments:
Petrochemical Cryogenic storage tanks, ethylene plants, propane dehydrogenation units
Power Generation Nuclear power plants, LNG-fired power stations, cold region power transmission towers
Oil & Gas Arctic oil/gas pipelines, offshore platforms, low-temperature gathering lines
Chemical High-pressure fertilizer equipment, cryogenic separation systems
Construction Bridges, buildings, and infrastructure in cold regions (e.g., Northeast China, Mongolia)
Shipbuilding & Marine Vessels operating in polar waters, LNG carrier cargo systems
Machinery Low-temperature pressure vessels, refrigeration equipment components
Grade Equivalents (International Cross-Reference)
| 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.
Audited Supplier 
S355J0 steel pipe is a type of tubing manufactured from S355J0 non-alloy high-strength structural steel that complies with EN 10025-2 standard. It is widely used in engineering and machinery fields under the European standard system, and serves as one of the core products in the metal materials foreign trade sector targeting markets in Europe, Southeast Asia and beyond.
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