What are the common applications for these tubes?

They are widely used in automotive powertrains, hydraulic systems, heat exchangers, mining machinery, and aerospace.

What are the accepted payment and delivery terms?

We accept T/T, L/C in USD, EUR, HKD, CNY. Delivery terms include FOB, CFR, CIF, EXW, DDP, and DDU.

Can you provide OEM or custom services?

Yes, we support OEM services with customizable steel grades, delivery conditions, and specific application requirements.

Black Phosphating Seamless Cold Drawn Carbon Steel Tubes for Precision Equipment

Name: Black Phosphating Seamless Cold Drawn Carbon Steel Tubes for Precision Equipment
Brand: Zhangjiagang Chewit International Co., Ltd.
SKU: 2139873185

Jiangsu, ChinaZhangjiagang Chewit International Co., Ltd.

US$1.50-7.00

1,000 kg

Product profile

Customization

Available

Type

Seamless

Technique

Cold Drawn

Model NO.

E215/235/255/355

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, Mining, Heat Exchanger

Section Shape

Round

Standard

DIN, GB/T, En, ASTM, SAE, JIS, ISO, NF, BS, GOST

Delivery Condition

Bk, Gbk, Bkw, Bks or Nbk

Steel Grade

Tu37b Tu52b

Certificate

ISO 9001 Ts16949

Secondary or Not

Non-Secondary

Application

Automotive, Hydraulic System and Precision Device

Transport Package

Plywood Box or Bundles

Specification

OD2-60mm

Trademark

Origin

China

HS Code

7304319000

Key features

High Precision Dimensions: Outer diameter 2-60mm, wall thickness 0.3-10mm with tight tolerances for precision equipment.

Superior Surface Finish: Lower roughness on inner and outer surfaces via bright annealing and black phosphating.

Wide Standard Compliance: Meets DIN, GB/T, ASTM, EN, JIS, ISO, and other international steel pipe standards.

Versatile Application: Ideal for automotive, hydraulic systems, heat exchangers, and precision machinery.

Rigorous Quality Control: 100% eddy current test, size/surface check, and professional pre-production sampling.

Customizable Specifications: Supports custom steel grades, delivery conditions, and specific application requirements.

Multiple Material Options: Available in Carbon Steel, Alloy Steel, and Stainless Steel for diverse needs.

Flexible Trade Terms: Accepts FOB, CFR, CIF, EXW, DDP, DDU with USD, EUR, HKD, CNY payment options.

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: ≤7.35h 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.