Seamless Steel Tubes and Pipes for Gas Cylinders with Large Diameter 4130/4140 (ASTM A519) High Quality

• Customization: Available
• After-sales Service: 24h Online
• Type: Seamless/Welded
• Technique: Hot/Cold Rolled,Cold Draw,ERW,Saw,Efw,Extrude
• Material: Carbon,Stainless,Alloy
• Surface Treatment: Black/Varnishing/Polished/Oiled/Galvanized
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Delivery: at Stock or 7-15 Days According to The Quantity
• Length: as Customer′s Requirement
• Width: as Customer′s Requirement
• Thickness: as Customer′s Requirement
• Capacity: 200000ton/Year
• Payment: T/T L/C
• Certificate: CCS, ABS, BV API, ISO9001
• Sample: Provide
• Transport Package: Neutral Standard Export Seaworthy Packing
• Specification: As customer′ s requirement
• Trademark: TONGNO
• Origin: China
• Production Capacity: 200000ton/Year

Product Description

 

Product Description

Seamless steel tubes and pipes for large-diameter gas cylinders are precision-engineered to store and transport high-pressure gases such as CNG (Compressed Natural Gas), LPG (Liquefied Petroleum Gas), hydrogen, oxygen, nitrogen, and industrial gases. These tubes are manufactured without welds to ensure maximum strength, pressure resistance, and safety in critical applications.

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


Uses:  For the manufacture of gas cylinders with hot-rolled large diameter seamless steel pipe
 

Main production steel pipe grades:  37Mn,30CrMo,35CrMo,STH11,STH12,STH21,STH22,4130X

Mechanical properties:
 

Standard	Grade	Tensile strength (MPa)	Yield strength (MPa)
API SPEC 5CT	J55	≥517	379~552
	K55	≥517	≥655
	N80	≥689	552~758
	L80(13Cr)	≥655	552~655
	P110	≥862	758~965

Chemical composition:

Standard

Grade

Chemical Components(%)

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

Als

API SPEC 5CT

J55K55

0.34~0.39

0.20~0.35

1.25~1.50

≤0.020

≤0.015

≤0.15

≤0.20

≤0.20

≤0.020

(37Mn5)

N80

0.34~0.38

0.20~0.35

1.45~1.70

≤0.020

≤0.015

≤0.15

0.11~0.16

≤0.020

(36 Mn2V)

L80(13Cr)

0.15~0.22

≤1.00

0.25~1.00

≤0.020

≤0.010

12.0~14.0

≤0.20

≤0.20

≤0.020

P110

0.26~0.35

0.17~0.37

0.40~0.70

≤0.020

≤0.010

0.80~1.10

≤0.20

≤0.20

0.15~0.25

≤0.08

≤0.020

(30CrMo)

 

Detailed Photos

 

Certifications

 

Packaging & Shipping

Packing Details:
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.

Company Profile

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. Level. Products at home and abroad enjoy a reputation for a variety of project construction, play their own characteristics of manufacturing energy.

Our Advantages

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.

FAQ

Q1: What are your primary product offerings?

A1: We are a leading manufacturer and supplier of high-quality steel products, specializing in:
Stainless Steel & Carbon Steel: Sheets/plates, coils, and pipes/tubes (both seamless and welded)
Structural Components: Various bar profiles (round, square, hexagonal, flat, angle), C-channels, and H/I-beams
Custom Fabrications: Tailored solutions to meet specific project requirements

Q2: What quality assurance measures do you have in place?

A2: We maintain stringent quality control through:
Comprehensive Mill Test Certificates provided with all shipments
Optional third-party inspection services (SGS, BV, etc.)
ISO-certified manufacturing processes
Rigorous in-house testing and quality checks

Q3: What are your standard packaging terms?

A3: Our standard packaging includes:
Bundled or coiled goods secured with steel rods/straps
Custom packaging solutions available per customer specifications
Export-grade packaging to ensure optimal protection during transit

Q4: What is your typical delivery timeline?

A4: We offer flexible delivery options:
Stock items: Ready for shipment within 3 business days after deposit confirmation
Made-to-order items: Production typically completed within 7-15 working days post-deposit
Expedited options available for urgent requirements

Q5: What competitive advantages does your company offer?

A5: We differentiate ourselves through:
A team of highly skilled professionals and technical experts
Industry-leading pricing without compromising quality
Unparalleled after-sales support and customer service
Extensive inventory and reliable supply chain management

Q6: Do you provide product samples?

A6: Yes, we're pleased to offer:
Complimentary small samples from existing inventory
Customer only responsible for shipping costs
Custom samples available for specific project needs

Q7: What are your payment terms?

A7: Our standard payment structure:
30% advance payment via T/T to initiate production/order
Remaining 70% balance due prior to shipment
Full documentation including product photos and packaging details provided before final payment
 

Why Choose Us?

√ 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.