What payment terms are accepted?

We accept LC (Letter of Credit) and T/T (Telegraphic Transfer) as payment terms.

Is OEM service available?

Yes, OEM service is available, and we can customize standards, delivery conditions, and steel grades.

What quality certifications do you have?

We hold ISO 9001 and TS16949 certifications, and provide test reports for raw materials including RoHS.

GB/T3639 Cold Rolled Precision Steel Pipe for Hydraulic Cylinder

Name: GB/T3639 Cold Rolled Precision Steel Pipe for Hydraulic Cylinder
Brand: Zhangjiagang Chewit International Co., Ltd.
SKU: 2057247415

Jiangsu, ChinaZhangjiagang Chewit International Co., Ltd.

US$1.50-7.00

1,000 kg

Product profile

Customization

Available

Type

Seamless

Technique

Cold Rolled

Material

Carbon Steel

Surface Treatment

Ba(Bright Annealed), Black Phosphated, Galvanizing

Usage

Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Mining, Special Purpose

Section Shape

Round

Standard

DIN 1629, 2391, 1630, En10305-1 10305-4, ASTM A519

Delivery Condition

Bkw, Bks, +LC, +Sr

Steel Grade

St35/45/52/37.4/44.4/52.4/E255/355/235 etc

Certificate

ISO 9001 Ts16949

Secondary or Not

Non-Secondary

Application

Precision Application

Transport Package

Bundles or Boxes

Specification

OD5-250mm

Origin

China

HS Code

7304319000

Key features

High Precision Tolerance: ID tolerance minimized to +/-0.02mm for hydraulic cylinder applications.

Multiple Surface Treatments: Available in Bright Annealed, Black Phosphated, and Galvanizing options.

Wide Material Range: Supports various steel grades including St35, St45, St52, 1010, 1045, and 4140.

Strict Quality Control: Double inspection by professional controllers with vivid test reports provided.

Versatile Applications: Suitable for hydraulic cylinders, automotive parts, and precision machinery.

Flexible Customization: Customizable standards, delivery conditions, and steel grades to meet specific needs.

Global Standards Compliance: Meets DIN, ASTM, EN, JIS, and GB/T standards for international use.

Reliable Manufacturer: Established in 2010 with over 150,000 sqm area and 200+ employees.

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: ≤4.32h 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.