302 Stainless Seamless Steel Pipe
302 stainless steel seamless pipe is a high-quality steel pipe made from austenitic stainless steel. It is durable, corrosion-resistant, and has excellent resistance to high temperatures. The strength of 302 stainless steel seamless pipe is superior to that of ordinary steel pipes, making it a popular choice in various industries.
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Description
Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of 302 stainless seamless steel pipe in China. With abundant experience, we warmly welcome you to wholesale customized 302 stainless seamless steel pipe from our factory. For price consultation, contact us.
Type 302 stainless steel seamless pipe (UNS S30200) is a classic 18Cr-8Ni austenitic steel; with a maximum carbon content of 0.15%-higher than that of Type 304-it offers significantly enhanced strength following cold working. It features a tensile strength of 515–655 MPa, a yield strength of ≥205 MPa, and an elongation of 40–50%. It is non-magnetic in the annealed state, exhibits excellent corrosion resistance, and maintains its mechanical properties at temperatures up to 550°F (288°C). The seamless manufacturing process eliminates longitudinal weld seams-a common structural weak point-resulting in uniform wall microstructure and superior pressure-bearing capacity, making it ideal for high-pressure, high-temperature applications in the chemical, food processing, pharmaceutical, and fluid transport industries.
Gnee offers a comprehensive range of Type 302 seamless pipes with outer diameters of φ6–273 mm, wall thicknesses of δ1–30 mm, and fixed lengths of 1000–8000 mm. These products comply with various international standards, including AISI, ASTM A312, DIN, JIS, BS, and NB, and hold certifications from SGS, BV, TUV, and ISO. Strict quality control ensures wall thickness tolerances within ±0.1 mm, outer diameter precision of ±0.05 mm, and an inner surface roughness of Ra ≤0.8 μm; each batch is supplied with an EN 10204 3.1 Material Test Certificate (MTC) to guarantee full traceability.
Chemical Composition (wt %)
| Element | Min | Max | Typical |
| C | - | 0.15 | 0.08 |
| Cr | 17.0 | 19.0 | 18.0 |
| Ni | 8.0 | 10.0 | 9.0 |
| Mn | - | 2.00 | 1.0 |
| Si | - | 1.00 | 0.5 |
| P | - | 0.045 | 0.03 |
| S | - | 0.030 | 0.01 |
| N | - | 0.10 | 0.03 |
| Fe | Balance | - | ~70 |
302 stainless steel Equivalent Grade
| Standard System | Country | Designation |
| UNS / SAE | USA | S30200 |
| ASTM / AISI | USA | 302 / TP302 |
| EN / WNR | Europe | 1.4319 / X8CrNi18-9 |
| JIS | Japan | SUS 302 |
| GB | China | 06Cr17Ni12 |
| AFNOR | France | Z8CND18-9 |
| BS | UK | 302S25 |
| SS | Sweden | 2332 |
| DIN | Germany | 1.4319 |
Mechanical Properties (Annealed / Solution-Treated)
| Property | Metric |
| Tensile Strength (Rm) | ≥ 515 MPa |
| Yield Strength (Rp0.2) | ≥ 205 MPa |
| Elongation (A50mm) | ≥ 40 % |
| Reduction of Area (Z) | ≥ 55 % |
| Hardness (HRB) | ≤ 92 |
| Hardness (HBW) | ≤ 201 |
| Modulus of Elasticity (E) | 193 GPa |
| Shear Modulus (G) | 77 GPa |
| Poisson's Ratio (ν) | 0.29 |
| Fatigue Strength (10⁷ cycles) | ~240 MPa |
ASTM A312 / ASME B36.19M Seamless Pipe Dimensions
Outside Diameter by NPS
| NPS | OD (in) | OD (mm) |
| 1/8″ | 0.405 | 10.3 |
| 1/4″ | 0.540 | 13.7 |
| 3/8″ | 0.675 | 17.1 |
| 1/2″ | 0.840 | 21.3 |
| 3/4″ | 1.050 | 26.7 |
| 1″ | 1.315 | 33.4 |
| 1-1/4″ | 1.660 | 42.2 |
| 1-1/2″ | 1.900 | 48.3 |
| 2″ | 2.375 | 60.3 |
| 2-1/2″ | 2.875 | 73.0 |
| 3″ | 3.500 | 88.9 |
| 4″ | 4.500 | 114.3 |
| 6″ | 6.625 | 168.3 |
| 8″ | 8.625 | 219.1 |
| 10″ | 10.750 | 273.0 |
| 12″ | 12.750 | 323.8 |
| 16″ | 16.000 | 406.4 |
| 20″ | 20.000 | 508.0 |
| 24″ | 24.000 | 609.6 |
| 30″ | 30.000 | 762.0 |
Wall Thickness by Schedule (mm)
| NPS | SCH 5S | SCH 10S | SCH 40S | SCH 80S |
| 1/2″ | 1.65 | 2.11 | 2.77 | 3.73 |
| 3/4″ | 1.65 | 2.11 | 2.87 | 3.91 |
| 1″ | 1.65 | 2.77 | 3.38 | 4.55 |
| 1-1/2″ | 1.65 | 2.77 | 3.56 | 5.08 |
| 2″ | 1.65 | 2.77 | 3.91 | 5.54 |
| 3″ | 1.65 | 2.77 | 5.49 | 7.62 |
| 4″ | 1.65 | 3.05 | 6.02 | 8.56 |
| 6″ | 1.65 | 3.40 | 7.11 | 10.97 |
| 8″ | 2.77 | 3.76 | 8.18 | 12.70 |
| 10″ | 2.77 | 4.19 | 9.27 | 15.09 |
| 12″ | 2.77 | 4.57 | 9.53 | 17.48 |
Dimensional Tolerances
| Parameter | Requirement |
| OD (≤ 48.26 mm) | +0.40 / −0.80 mm |
| OD (> 48.26 mm) | ± 1% of OD |
| Wall Thickness | −12.5% (min); no "over" tolerance for SMLS |
| Length (definite cut) | +6.40 mm / 0 (no under) |
| Straightness (SMLS) | 1/8″ per 10 ft (3.2 mm per 3 m) |
| Standard Length | 5.8 – 12 m (19 – 40 ft); custom available |
| Max Length | 12 m typical; up to 18 m on request |
302 stainless steel Round pipe Applications
| Industry | Typical Use |
| Structural / Architectural | Railings, handrails, balustrades, frames |
| Automotive | Exhaust systems, fuel lines, structural tubing |
| Food & Beverage | Conveyors, frames, non-pressure piping |
| Mechanical | Springs, formed parts, high-strength tubing |
| General Industrial | Piping, tanks, structural supports |
| Aerospace | Non-critical structural tubing, brackets |
| Medical | Frames, non-implant equipment housings |
To help source or specify the right 302 stainless seamless steel pipe, could you share:
• The required outer diameter and wall thickness (or pipe schedule)?
• Your estimated length and quantity needed?
• What specific industry or operating environment (temperature, pressure, chemicals) it will be used in?
FAQ
Q: What are your company's main products ?
A: Our main products are stainless steel plate/sheet, coil, round/square pipe, bar, nickel alloys, etc.
Q: How do you control quality ?
A: Mill Test Certification is supplied with shipment, Third Party Inspection is available. and we also get ISO,SGS,Alibaba Verified.
Q: What are the advantages of your company ?
A: We have many professionals, technical personnel, more competitive prices and best after-dales service than other stainless steel companies.
Q: How many coutries you already exported ?
A: Exported to more than 60 countries mainly from America, UK, Kuwait, Egypt, Turkey, Jordan,India, etc.
Q: Can you provide sample ?
A: Yes. We can provide the small samples in stock for free, as long as you contact us.Customized samples will take about 5-7 days.
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