How do you guarantee product quality?

We conduct a pre-production sample check, final inspection before shipment, and double inspection by professional quality controllers.

What are the common applications for these seamless steel pipes?

They are widely used in hydraulic cylinders, automotive power steering systems, shock absorbers, construction machinery, and fitness equipment.

What is the ID tolerance for these pipes?

The ID tolerance can be minimized to +/-0.02mm, ensuring high precision for critical applications.

En10305 DIN2391 E235 E355 Od20-60mm Cold Rolled/Rolling Round Carbon Material High Precision Seamless Steel Pipe

Name: En10305 DIN2391 E235 E355 Od20-60mm Cold Rolled/Rolling Round Carbon Material High Precision Seamless Steel Pipe
Brand: Zhangjiagang Chewit International Co., Ltd.
SKU: 2019451255

Jiangsu, ChinaZhangjiagang Chewit International Co., Ltd.

US$1.50-5.00

1,000 kg

Product profile

Customization

Available

Type

Seamless

Technique

Bright Annealed, Black Phosphated or Galvanized

Model NO.

CDS-15

Material

E215/235/255/355

Surface Treatment

Oiled

Usage

Pipeline Transport, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Construction & Decoration

Section Shape

Round

Product Name

Cold Rolled Steel Pipe

Application

Hydraulic Cylinder,Industry Jack

Standard

as Per Request

MOQ

2 Tons

Delivery Time

55 Days

Transport Package

Bundles or Boxes

Specification

as per standard or request

Origin

China

HS Code

7304319000

Key features

High Precision Tolerance: ID tolerance can be minimized to +/-0.02mm for superior precision.

Multiple Surface Treatments: Available in Bright Annealed, Black Phosphated, Galvanized, or Oiled finishes.

Wide Material Range: Supports E235, E355, ST35, ST45, ST52, 1010, 1045, 4130, and more.

Versatile Applications: Ideal for hydraulic cylinders, automotive parts, and construction machinery.

Strict Quality Control: Double inspection by professional controllers ensures defect-free delivery.

Custom Standards: Manufactured to DIN, ASTM, JIS, GB, and other international standards.

Flexible MOQ: Low minimum order quantity of 2 Tons for easier procurement.

Global Delivery: 55-day delivery time with support for FOB, CFR, CIF, and other terms.

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: ≤6.94h 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.