| Customization: | Available |
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| After-sales Service: | 24h Online |
| Type: | Seamless/Welded |
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Large diameter seamless steel pipes for gas cylinders are specialized tubular products designed for the manufacture of high-pressure gas storage equipment. These pipes are typically made from high-quality carbon or alloy steels and undergo rigorous processes to ensure they meet stringent safety standards and performance requirements.
These seamless steel pipes are integral to the construction of large-capacity gas cylinders used in various industries, including oil and gas, chemical processing, and transportation of compressed natural gas (CNG). Their ability to withstand high internal pressures makes them essential for safe and efficient gas storage and transfer.
Standard:
GB/T 18248 -- China National Standard
Q/321088HGB3 -- Enterprise standard of Jiangsu Chengde Steel Pipe Co.
ASTM A519 -- American Society for Testing and Materials (ASTM) Standard
JIS G3429 -- Japanese Industrial Standard
DOT49CFR178.37 -- U.S. Department of Transportation (DOT) Standards
Main production steel pipe grades:
STH11,STH12,STH21,STH22,Gr.C,Gr.E,4130X
Uses:
For the manufacture of gas cylinders with hot-rolled large diameter seamless steel pipe
Dimensional tolerances:
| Pipe Types | Diameter(D) | Wall thickness(S) | ||
| Outer diameter of steel pipe(mm) | Permissible deviation(mm) | Wall thickness of steel pipe(mm) | Permissible deviation(mm) | |
| Hot Rolled Pipe | φ559 | ±1.0% | 17 | -0%,+25 |
| Standard | Grade | Chemical Components(%) | |||||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | Mo | V | ||
| Q/321088HGB3 | 4130X | 0.25~0.35 | 0.15~0.35 | 0.40~0.90 | ≤0.020 | ≤0.010 | 0.80~1.10 | ≤0.25 | ≤0.20 | 0.15~0.25 | ≤0.08 |
| GB/T 18248 | 37Mn | 0.34~0.38 | 0.10~0.35 | 1.35~1.75 | ≤0.020 | ≤0.010 | ≤0.30 | ≤0.30 | ≤0.20 | - | - |
| 30CrMo | 0.26~0.33 | 0.17~0.37 | 0.40~0.70 | ≤0.020 | ≤0.010 | 0.80~1.10 | ≤0.30 | ≤0.20 | 0.15~0.25 | - | |
| 35CrMo | 0.32~0.40 | 0.17~0.37 | 0.40~0.70 | ≤0.020 | ≤0.010 | 0.80~1.10 | ≤0.30 | ≤0.20 | 0.15~0.25 | - | |
| JIS G 3429 | STH11 | ≤0.50 | 0.10~0.35 | ≤1.80 | ≤0.035 | ≤0.035 | - | - | - | - | - |
| STH12 | 0.30~0.41 | 0.10~0.35 | 1.35~1.75 | ≤0.030 | ≤0.030 | - | - | - | - | - | |
| STH21 | 0.25~0.35 | 0.15~0.35 | 0.40~0.90 | ≤0.030 | ≤0.030 | 0.80~1.20 | ≤0.25 | - | - | - | |
| STH22 | 0.33~0.38 | 0.15~0.35 | 0.40~0.90 | ≤0.030 | ≤0.030 | 0.80~1.20 | ≤0.25 | - | - | - | |
| Standard | Grade | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| Q/321088HGB3 | 4130X | 725~865 | 485~735 | ≥20 |
| GB/T 18248 | 37Mn | ≥750 | ≥630 | ≥16 |
| 30CrMo | ≥930 | ≥785 | ≥12 | |
| 35CrMo | ≥985 | ≥835 | ≥12 | |
| JIS G 3429 | STH11 | ≥750 | ≥630 | ≥16 |
| STH12 | ≥750 | ≥630 | ≥16 | |
| STH21 | ≥480 | ≥320 | ≥22 | |
| STH22 | ≥410 | ≥275 | ≥20 |
1.Export sea worthy package + water proof paper
2.Safe loading and fixing Professional teams
Delivery Detail: within 7-10 working days after receiving the deposit or according to your order quantity.
Wuxi Tongno Special Steel Co., Ltd. was founded in 2013, the registered capital of 5 million yuan, for the professional production of seamless steel pipe manufacturing enterprises; after years of rapid development, Wuxi Tongno Special Steel Co., Ltd. now has three types of seamless steel pipe production line;
Wuxi Tongno Special Steel Co., Ltd. has been adhering to the 'quality first, customer first' business philosophy, to ensure that the products of high-precision, wide range of wall thicknesses, small quantities of many varieties, fast-paced characteristics of the production, sales in the domestic advanced level, especially in the small-diameter medium-thick-walled and large-calibre thin-walled alloy seamless steel pipe production at the domestic advanced level. Products at home and abroad enjoy a reputation for a variety of project construction, play their own characteristics of manufacturing energy.
1. Exceptional Service: We guarantee a response to all inquiries within 12 hours.
2. Certifications: Proudly holding ISO 9001, CE, and SGS certifications.
3. Cost - Effective Quality: Benefit from competitive prices and top - notch quality, as our products are directly sourced from our own factory.
4. Robust Production Capacity: With a monthly output of 20,000 tons, we ensure seamless production.
5. Flexible Payment Terms: We accept various payment methods, including T/T and L/C.
6. Swift Delivery & Standard Export Packaging: Expect quick delivery and products packaged in line with international export standards.
7. Factory - Direct Advantage: Our own factory enables us to offer competitive prices without compromising on quality.
8. Third - Party Testing: We welcome any third - party testing to verify the quality of our products.
9. Expert Team Support: Backed by a professional sales team and a reliable factory.
10.Dedicated to Customization: Your individual specifications are not just accepted-they're the cornerstone of our service. We're committed to delivering on every customized request.
√ Quality Assurance: Rigorous testing and certification
√Competitive Pricing: Cost-effective solutions without compromise
√ Reliable Delivery: On-time fulfillment guaranteed
√ Custom Solutions: Tailored to your exact specifications
√ Expert Support: Technical guidance at every stage
For further inquiries or specific requirements, please contact our sales team. We're committed to providing exceptional service and top-quality steel products for your projects.
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