When global buyers search for a
seamless steel pipe supplier, they want three things above all else:
quality,
reliability, and
competitive pricing. Zhangjiagang Chewit International Co., Ltd. — operating at
pipecw.com — delivers all three, backed by over 20 years of manufacturing experience and exports to more than 50 countries worldwide.
Whether you need
carbon steel seamless pipe,
alloy steel tube,
hydraulic steel tube,
stainless steel pipe, or specialized
CNG tube and
cold drawn steel tube, Chewit International produces it all — factory-direct, at wholesale prices, with full international certification.
Over 20 Years of Steel Pipe Manufacturing Experience — Trusted by 50+ Countries
Chewit International is not a trading company. It is a
direct manufacturer based in Zhangjiagang, Jiangsu — one of China's most important steel production hubs. Since its founding, the company has supplied
seamless steel tubes and related products to clients in Europe, North America, Southeast Asia, the Middle East, and beyond.
Here is why international buyers trust Chewit International:
• 20+ years of continuous manufacturing and export experience
• Exports to
50+ countries across 6 continents
• ISO-certified quality management system
• Full compliance with
ASTM, API, DIN, and GB standards • In-house testing: eddy current inspection, high-pressure testing, metal element analysis
• Fast lead times with reliable global logistics support
This track record makes Chewit International one of the most dependable sources for
seamless steel pipe from China — especially for B2B buyers, importers, and engineering procurement teams.
Complete Product Range — Seamless Steel Pipes for Every Application
Chewit International manufactures a comprehensive range of
seamless steel tubes and metal products. Below is a full overview of what they supply:
| Product Category |
Key Types |
Common Applications |
| Carbon Steel Tube |
DIN2391, EN10305-4 seamless steel pipe |
Oil & gas, construction, fluid transport |
| Stainless Steel Pipe |
304, 304L, 316, 316L grades |
Food processing, chemical, marine |
| Alloy Steel Tube |
High-temp & pressure grades |
Power plants, boilers, refineries |
| Hydraulic Steel Tube |
Cold drawn, precision bore |
Hydraulic systems, cylinders |
| CNG Tube |
High-pressure certified |
Compressed natural gas systems |
| Automotive Tubes |
Precision seamless and welded |
Vehicle manufacturing, fuel lines |
| Bundy Tube |
Double/Single-walled steel(Galvanized or Copper Coated) |
Brake & fuel lines |
| Cold Drawn Steel Tube |
Tight tolerances ±0.05mm |
Precision engineering |
| Aluminum Tube |
6061, 6063, 7075, 7001alloy |
Structural, aerospace, consumer |
| Aluminum Telescopic Pole |
Anodized aluminum |
Outdoor, industrial, medical |
In addition to
seamless steel pipe, Chewit supplies
aluminum telescopic pole,
aluminum tent pole,
anodized aluminum tube,
open die forging parts,
closed die forging parts,
forging small parts, and
titanium tube — making them a versatile one-stop procurement partner.
Factory-Direct Pricing with ISO-Certified Quality and Fast Global Shipping
Buying directly from a
seamless steel pipe manufacturer in China eliminates middlemen and lowers your total procurement cost significantly. Chewit International operates as a
factory-direct supplier, which means:
• Lower unit prices compared to trading companies or distributors
• Custom specifications available — diameter, wall thickness, length, grade, and surface finish
• OEM orders welcome — private labelling and tailored packaging available
• No hidden fees — transparent pricing with full MTC (material test certificate) documentation
• Flexible MOQ — accommodates both small trial orders and large bulk shipments
Every order ships with a
3.1 material test certificate per EN 10204. Third-party inspection by SGS, TÜV, BV, DNV-GL, LR, and ABS is fully supported upon request.
Carbon vs Alloy vs Hydraulic Pipe — Which Seamless Steel Pipe Is Right for You?
Not all seamless steel pipes are the same. The right grade depends on your application, pressure requirements, temperature range, and environment. Here is a simple comparison:
| Pipe Type |
Best For |
Key Standard |
Temperature Range |
| Carbon Steel Seamless |
General fluid & gas transport |
DIN2391, EN10305-4/1, BS6323-4...... |
Up to 425°C |
| Alloy Steel Seamless |
High-temp, high-pressure use |
ASTM A519 |
Up to 650°C |
| Stainless Steel Seamless |
Corrosive environments |
ASTM A269 |
Cryogenic to 870°C |
| Hydraulic Steel Tube |
Precision fluid power systems |
DIN EN 10305-4, DIN2391 |
Up to 200°C |
| CNG Pipe |
Compressed gas storage |
ISO 11439 |
High-pressure rated |
If you are unsure which grade to choose, Chewit International's technical team can help you select the correct
seamless steel pipe based on your project specifications — free of charge.
What Makes a High-Quality Seamless Steel Pipe? Key Factors Explained
Before placing a bulk order, every procurement manager should understand what separates a premium
seamless steel tube from a substandard one.
1. Manufacturing Method
All genuine
seamless steel pipes are produced without a weld seam, using either the
cold rolling or
cold drawing process. Cold-drawn pipes offer tighter dimensional tolerances — as precise as
±0.05mm — making them ideal for hydraulic and automotive applications.
2. Material Traceability
Every pipe must come with a
Mill Test Certificate (MTC) that traces the material back to its heat number, chemical composition, and mechanical properties. Chewit sources raw materials from China's top-tier mills including Baosteel and Tisco.
3. Dimensional Accuracy
Precise OD, ID, and wall thickness are critical — especially for
hydraulic steel tube and
automotive tubes. Chewit uses advanced CNC machinery and non-destructive testing (NDT) to verify every batch.
4. Surface Quality
Surface defects, pits, or seams can compromise pipe performance under pressure. Chewit applies
eddy current inspection and
ultrasonic testing to detect surface and sub-surface flaws before shipment.
5. Certification & Compliance
Look for compliance with
DIN2391, EN10305-4, ASTM A269, JIS G3445, DIN1629, SAE J524 and GB/T 8162. All Chewit International products meet international standards and carry ISO 9001 certification.
Seamless Steel Pipes Available in All Sizes, Grades and Wall Thicknesses
Chewit International supplies
seamless steel pipe in a wide range of sizes to suit virtually any engineering or industrial requirement:
| Specification |
Range Available |
| Outer Diameter (OD) |
10mm – 200mm |
| Wall Thickness |
1mm – 60mm |
| Length |
Standard 5.8m / 6m or custom cut |
| Tolerances (Cold Drawn) |
±0.05mm on OD and wall |
| Surface Options |
BA, Galvanized, Black Phosphated |
Products are available in
plain end, beveled end, threaded & coupling configurations. Custom marking, bundling, and end protection are all available per customer requirements.
High-Pressure Seamless Pipe for Oil, Gas, Automotive and Industrial Use
Industries that rely on Chewit International's
seamless steel pipe and related products include:
• Oil & Gas: API 5L line pipe, casing, and tubing for drilling and transportation
• Automotive: Precision seamless tubes for fuel systems, brake lines, and chassis components
• Hydraulic Engineering: Cold-drawn hydraulic steel tube for cylinders and power systems
• Construction & Infrastructure: Carbon steel structural pipe for building and civil projects
• Chemical & Petrochemical: Alloy and stainless steel pipe for corrosive media
• CNG & Energy: High-pressure CNG tube for natural gas vehicles and stations
• Medical & Precision: Tight-tolerance cold drawn tubes for instruments and devices
No matter your industry, Chewit International has a
seamless steel tube solution that meets your pressure, temperature, and dimensional requirements.
ASTM A106 / API 5L / DIN 2448 Compliant Seamless Pipes — Ready to Export
International buyers require full compliance with recognized standards. Chewit International's
seamless steel pipes are manufactured and tested to the following globally accepted specifications:
• ASTM A106 – Standard for seamless carbon steel pipe for high-temperature service
• ASTM A53 – General service welded and seamless steel pipe
• API 5L – Line pipe for oil and gas pipeline systems
• DIN 2448 / EN 10216 – European standard for seamless steel tubes for pressure purposes
• GB/T 8162 – Chinese national standard for structural seamless steel pipes
• ISO 9001:2015 – Quality management system certification
Third-party inspection is available through
SGS, TÜV, BV, DNV-GL, LR, and
ABS. All documentation — including
EN 10204 3.1 test certificates — is provided with every shipment.
A Complete Buyer's Guide to Seamless Steel Pipe Specifications and Standards
Before placing an order with any seamless steel pipe manufacturer, confirm these key details:
| Step |
What to Confirm |
Why It Matters |
| 1 |
Material grade (carbon, alloy, stainless) |
Determines mechanical & chemical properties |
| 2 |
Applicable standard (ASTM, API, DIN, GB) |
Ensures compliance with your local regulations |
| 3 |
OD, wall thickness, and length |
Affects flow capacity and pressure rating |
| 4 |
End finish (plain, beveled, threaded) |
Impacts joining method on site |
| 5 |
Surface treatment (bare, varnished, galvanized) |
Prevents corrosion during transport & storage |
| 6 |
Test certificates required (3.1, 3.2, SGS) |
Confirms material authenticity and quality |
| 7 |
MOQ and lead time |
Confirms order feasibility and delivery timeline |
Chewit International's sales and technical team can guide you through every step of this process.
OEM orders, custom sizes, and special surface treatments are all available on request.
Your Reliable China-Based Steel Pipe Partner for B2B and Wholesale Supply
Chewit International is not just a supplier — it is a long-term manufacturing partner. The company's commitment to
transparent communication,
on-time delivery, and
consistent product quality has earned the trust of importers, distributors, and engineering companies worldwide.
Key partnership advantages:
• Dedicated account managers for every client
• Pre-shipment quality inspection with full photographic reporting
• Flexible payment terms for long-term B2B customers
• Multilingual support — English, Spanish, Arabic, French, and more
• Export packaging designed for sea freight and air freight — no damage in transit
• Repeat order discounts and volume pricing for wholesale buyers
Get a Free Quote on Bulk Seamless Steel Pipe Orders — Direct from the Factory
Ready to source
seamless steel pipe directly from a verified Chinese manufacturer? Contact Chewit International today for a
fast, no-obligation quote.
| WhatsApp |
+86 189 6224 4644 |
Whether you need
carbon seamless pipe,
hydraulic steel tube,
stainless steel pipe,
alloy steel tube,
CNG tube,
cold drawn steel tube,
aluminum telescopic pole,
forging small parts, or
galvanized steel pipe — Chewit International delivers the right product, on time, at the right price.
Send your specifications today and receive a
customized quote within 24 hours. Join 50+ countries that already trust Chewit International as their
seamless steel pipe manufacturer in China.
Frequently Asked Questions (FAQ)
What is a seamless steel pipe?
Seamless steel pipe is a pipe manufactured without a weld seam, produced from a solid steel billet. It offers higher strength, better pressure resistance, and superior reliability compared to welded pipe — making it ideal for oil & gas, hydraulic, and high-temperature applications.
What standards do Chewit's seamless pipes meet?
Chewit International's
seamless steel tubes comply with
ASTM A106, ASTM A53, API 5L, DIN 2448, EN 10216, and
GB/T 8162.
Can I order custom sizes?
Yes. Chewit International accepts
OEM and custom orders for
seamless steel pipe in non-standard OD, wall thickness, length, grade, and surface finish.
What is the minimum order quantity (MOQ)?
MOQ varies by product. Contact Chewit International directly at
sale@chewit.cn or via WhatsApp at
+86 189 6224 4644 to confirm MOQ for your specific product.
Does Chewit International support third-party inspection?
Yes. Third-party inspection by
SGS, TÜV, BV, DNV-GL, LR, and
ABS is fully supported. All products ship with a
3.1 MTC certificate per EN 10204.
+86 18962244644
SHUANGSHAN ROAD, JINGANG TOWN, ZHANGJIAGANG CITY, JIANGSU PROVINCE, CHINA
sale@chewit.cn
