How do you guarantee product quality?

We provide pre-production samples before mass production, conduct 100% Eddy Current Tests and size/surface checks, and perform final inspections before shipment.

What are the accepted payment terms and currencies?

Accepted payment types include T/T and L/C. Currencies accepted are USD, EUR, HKD, and CNY.

What are the delivery terms and lead times?

Delivery terms include FOB, CFR, CIF, EXW, DDP, and DDU. The average lead time is approximately one month for both peak and off-peak seasons.

Outer Diameter 3-30mm Precision Seamless Steel Tube for Hydraulic System

Name: Outer Diameter 3-30mm Precision Seamless Steel Tube for Hydraulic System
Brand: Zhangjiagang Chewit International Co., Ltd.
SKU: 2133279645

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.

E235 355

Material

Carbon and Alloy

Surface Treatment

Bright Annealing, Black Phosphating, Galvanizing

Usage

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

Section Shape

Round

Standard

DIN2391, En 10305-1, JIS G3445, ASTM A519

Delivery Condition

Bk, Gbk, Bkw, Bks or Nbk

Steel Grade

St35, St45, St52, E235, E355, 1010, Stkm 11A

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 & Low Roughness: Cold drawn seamless tubes with high precision and lower roughness for inner and outer surfaces.

High Pressure Resistance: Withstands high pressure, ensuring good mechanical performance for hydraulic and fuel systems.

Wide Material Selection: Available in Carbon, Stainless Steel, and Alloy grades including St35, St45, St52, 304, 316L.

Multiple Surface Treatments: Options include Bright Annealing, Black Phosphating, and Galvanizing for corrosion resistance.

Strict Quality Inspection: 100% Eddy Current Test, size/surface checking, and professional pre-production samples.

Versatile Applications: Suitable for Automotive, Aerospace, Hydraulic Systems, Oil/Gas Drilling, and Heat Exchangers.

Comprehensive Standards: Meets DIN, ASTM, JIS, EN, and GB standards for global compatibility and certification.

Custom Delivery Conditions: Flexible delivery states including BK, GBK, BKS, NBK to meet specific project requirements.

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.

Product Q&A

Q:What are the main advantages of this seamless steel tube?

The main advantages include high pressure resistance, good mechanical performance, high precision, and lower roughness for both inner and outer surfaces.

Q:What materials and steel grades are available?

Materials include Carbon, Stainless Steel, and Alloy. Available steel grades are St35, St45, St52, E235, E355, 1010, 304, 316L, and others as per standards.

Q:What are the standard size ranges for these tubes?

The Outer Diameter (OD) ranges from 2mm to 60mm, and Wall Thickness (WT) ranges from 0.3mm to 10mm. Specific inner diameters can go up to 12.5mm.

Q:Which international standards do you comply with?

We comply with DIN 2391, EN 10305-1, JIS G3445, ASTM A519, GB/T 8162, and other international standards for precision steel tubes.

Q:What surface treatments are offered?

We offer Bright Annealing, Black Phosphating, and Galvanizing to ensure durability and specific surface requirements.