How do you ensure product quality?

We conduct a pre-production sample check, final inspection before shipment, and 100% testing for size, surface, and eddy current.

What international standards do your pipes comply with?

Our pipes comply with DIN, EN, ASTM, SAE, JIS, NF, and BS standards, supported by EN 10204 3.1 certificates.

Hot Selling Precision Welding 4 Inch Carbon Welded Steel Pipes

Name: Hot Selling Precision Welding 4 Inch Carbon Welded Steel Pipes
Brand: Zhangjiagang Chewit International Co., Ltd.
SKU: 2021417875

Jiangsu, ChinaZhangjiagang Chewit International Co., Ltd.

US$1.00-7.00

1,000 kg

Product profile

Customization

Available

After-sales Service

1 Year

Warranty

1 Year

Model NO.

CWS2/CWS4/CWS5/etc

Type

Welded

Technique

Cold Rolled

Material

Carbon Steel

Surface Treatment

Bright Annealing,Black Phosphating,Galvanizing

Usage

Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Machinery Industry, Chemical Industry

Section Shape

Round

Standard

DIN/En/ASTM/SAE/NF/BS

Delivery Condition

Bk (+C) Bkw (+LC) Bks (+Sr) Gbk (+a) Nbk (+N)

Steel Grade

St34-2/E235/1010/Ts37A/Cws2/Low Carbon Steel

Condidtion

New

Certificate

ISO 9001 Ts16949

Application

Automotive,Hydraulic System and Precision Device

Name

High Quality Steel Pipe

Keywords

High Quality

Length

6m, as Per Request

Shape

Round

Outer Diameter

3-100mm

Oiled or Non-Oiled

Slightly Oiled

Invoicing

by Actual Weight

Processing Service

Cutting

Delivery Time

31-45 Days

Transport Package

Box or Bundles

Specification

OD3-100mm

Trademark

Origin

China

HS Code

7304319000

Key features

High Precision & Smooth Surface: Free from scale and rust with invisible welding seams and low roughness.

Wide Material & Size Range: Carbon steel with OD 3-100mm, customizable to various international standards.

Multiple Delivery Conditions: Available in BK, BKW, BKS, GBK, NBK conditions for specific mechanical needs.

Strict Quality Inspection: 100% eddy current, size, and surface checks with EN 10204 3.1 certificates.

Versatile Industrial Application: Suitable for automotive, hydraulic systems, machinery, and oil/gas drilling.

Customizable Length & Shape: Standard 6m or as per request, round shape with cutting service available.

Company profile

Zhangjiagang Chewit International Co., Ltd.

Jiangsu, China

CertifiedBusiness Type: Manufacturer/Factory & Trading Company CertifiedR&D Capacity: OEM Service AvailableExport Year: 2013-08-01 CertifiedNearest Port: shanghaiAverage Response Time: ≤5.72h CertifiedTerms of Payment: LC, T/T

AI-Powered supplier vetting

SummaryZhangjiagang Chewit is a China-based limited trading company established in 2010, with stated precision-tube and steel-forging manufacturing activities. The supplier reports ISO9001:2015 certification, more than 10 production lines, approximately 5,000 tons of annual seamless-steel-pipe productivity, broad export-market coverage, and one-month lead times in both peak and off-peak seasons. Its quality claims include 100% dimensional and surface checks, batch chemical and mechanical testing, and non-destructive testing upon request. Evidence is insufficient to assess after-sales service, financial credibility, and customization capability. Innovation evidence is limited to an associated forging operation reporting 11 authorized patents, while customer evidence consists of one listed buyer and one trade transaction.

Supplier typeThe supplier is identified as a China-based limited company and trade company, with stated manufacturing activities in precision steel tubes and forgings. Its product scope includes seamless, welded, carbon, stainless, hydraulic, cold-drawn, and precision tubes, indicating a specialized steel-product supplier with both trading and manufacturing positioning.

CertificationsThe supplier explicitly reports an ISO9001:2015 management-system certificate. It also describes inspection and industry-related qualifications associated with its forging operation, including API 20B, PED, and classification-society credentials, although the scope and holder of each qualification are not separately specified.

R&D capabilityThe supplier describes advanced production and inspection equipment, precision-tube manufacturing, and a forging operation with 11 authorized patents, including three invention patents. These statements provide explicit but limited evidence of process and product-development capability, mainly linked to the forging operation rather than clearly to the entire supplier entity.

Production capacityThe supplier reports more than 10 production lines, annual seamless-steel-pipe productivity of 5,000 tons, heat-treatment furnaces, inspection equipment, and manufacturing of precision tubes and forgings. The descriptions also cite a 10,000-square-meter tube operation and a substantially larger forging facility, although employee and facility figures are inconsistent across slices and should be verified.

Client casesThe supplier states that it serves wind power, oil and gas, transportation, shipbuilding, and gearbox sectors and has entered the global purchasing system of a major company since 2006. The trade data identifies one buyer and one transaction, so sector references are available but the breadth and depth of verifiable customer cases remain limited.