Seamless Precision Steel Tube - Custom Sizes Available

Kuaima Steel Co., Ltd.

Verified Custom manufacturer · 7 yrs ·

China

Customizable Rock-bottom price

$1045 1-49 ton Base price

$1000 50-99 ton 4.3% off

$975 ≥100 ton 6.7% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 1,045.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of Seamless Precision Steel Tube

Property	Parameter	Description
Product Name	Seamless Precision Steel Tube	Cold-drawn or cold-rolled seamless tube with tight tolerances
Material Grade	E235 / E355 / St35 / St52 / SAE 1020 / SAE 1045	Common precision tube steel grades
Standard Compliance	EN 10305-1, DIN 2391, ASTM A519, ISO 3304	Meets major international precision tube standards
Manufacturing Process	Cold Drawn / Cold Rolled	Seamless process for superior dimensional accuracy
Carbon (C)	0.10 - 0.50%	Varies by grade, provides strength
Manganese (Mn)	0.40 - 1.60%	Improves hardenability and tensile strength
Phosphorus (P)	≤0.025%	Controlled for improved ductility
Sulfur (S)	≤0.025%	Low sulfur for better machinability and weldability
Silicon (Si)	0.10 - 0.35%	Deoxidizer and strengthener
Tensile Strength	340 - 780 MPa	Depends on grade and heat treatment condition
Yield Strength	215 - 580 MPa	Minimum yield strength per applicable standard
Elongation	≥10 - 30%	Ductility varies by grade and wall thickness
OD Range	4mm - 120mm	Precision outer diameter with tolerance ±0.05mm to ±0.15mm
Wall Thickness	0.5mm - 20mm	Tight wall tolerance ±5% to ±10%
Length	1m - 12m or custom	Fixed, random, or cut-to-length available
Surface Finish	Bright Annealed, Phosphated, Oiled, Polished	Multiple surface treatment options for end-use requirements
Application	Hydraulic systems, automotive, machinery, pneumatic cylinders	Ideal for high-precision mechanical and fluid power applications
Certification	EN 10204 3.1, ISO 9001, IATF 16949	Quality certifications provided with shipment
Packaging	Bundled with plastic caps, oiled, wrapped in waterproof paper	Standard export packaging to prevent corrosion
MOQ	1 ton	Minimum order quantity for standard sizes

Seamless Precision Steel Tube - Custom Sizes Available

Seamless precision steel tube delivers exceptional dimensional accuracy and superior surface finish for applications where tight tolerances are non-negotiable. Manufactured through cold-drawn or cold-rolled processes, these tubes serve critical roles in hydraulic systems, automotive engineering, instrumentation, and mechanical assembly. Whether you require standard metric dimensions or fully customized specifications, our mill-direct supply ensures consistent quality with competitive lead times for global buyers.

What Is Seamless Precision Steel Tube?

A seamless precision steel tube is a hollow steel product manufactured without a welded seam, produced via hot extrusion followed by cold finishing to achieve precise outer diameter (OD), inner diameter (ID), and wall thickness tolerances. Unlike standard seamless tubes, precision variants undergo additional cold drawing or cold pilgering steps, resulting in dimensional tolerances as tight as ±0.05 mm on OD and surface roughness values of Ra ≤ 1.6 μm.

Seamless Precision Steel Tube Technical Specifications

Our precision seamless tubes are manufactured according to EN 10305-1:2016 and ASTM A519-17 standards. Common steel grades include E235 (St 35), E355 (St 52), SAE 1020, and SAE 1045. Key parameters include:

Seamless precision steel tube supplier

Parameter	Range
Outside Diameter	6 mm – 180 mm
Wall Thickness	1 mm – 25 mm
Length	Up to 12,000 mm (custom cut available)
OD Tolerance	±0.05 mm to ±0.15 mm per EN 10305-1
Tensile Strength (E355)	580–780 MPa minimum
Surface Finish	Ra ≤ 1.6 μm (bright annealed or phosphated)

Key Applications of Precision Seamless Steel Tubes

Hydraulic & Pneumatic Cylinders: Tight ID tolerances eliminate the need for internal honing in many configurations.
Automotive Components: Fuel injection lines, drive shafts, and shock absorber housings rely on cold-drawn precision tubing for consistent performance.
Industrial Machinery: Bearing sleeves, roller shafts, and linear guide housings demand the robust structural integrity these tubes provide.
Instrumentation & Medical Devices: Small-diameter precision tubes serve sensor housings and fluid control systems requiring exceptional cleanliness.

Why Choose Our Seamless Precision Steel Tube Supply

With over 15 years of export experience, we maintain an annual output exceeding 20,000 metric tons of cold-finished precision tubing. Every heat is traceable, and our facility holds ISO 9001:2015 and IATF 16949 certifications. We provide mill test certificates (MTC) per EN 10204 Type 3.1, ensuring full compliance with your project's quality documentation requirements.

Frequently Asked Questions

What is the minimum order quantity (MOQ) for precision seamless tubes?

Our standard MOQ starts at 1 metric ton per size and grade combination. For trial orders or prototype projects, smaller quantities may be arranged upon request.

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Do you provide material test certificates?

Yes. Every shipment includes EN 10204 Type 3.1 mill test certificates covering chemical composition, mechanical properties, and dimensional inspection results.

What is the typical delivery time for cold-drawn precision tubes?

Stock sizes ship within 7–10 business days. Custom-manufactured seamless precision steel tube orders typically require 25–35 days depending on quantity and finishing requirements.

Can you cut to custom sizes and apply special finishes?

Absolutely. We offer precision cutting to ±0.5 mm length tolerance, along with phosphating, bright annealing, chrome plating, and internal honing services to meet your exact specifications.

Get a Competitive Quote for Seamless Precision Steel Tube

Ready to source premium-grade precision seamless tubing at factory-competitive pricing? Contact our technical sales team today with your required dimensions, steel grade, and quantity. We respond to all inquiries within 24 hours with detailed pricing and lead time confirmation.

Seamless precision steel tube China

Ratings & Reviews

4.5

Based on 8 reviews

5 5

4 2

3 1

2 0

1 0

Ahmed Al-Hassan

UAE

2025-02-14

Acceptable Quality with Packaging Issue Resolved

Ordered 1.5 tons of SAE 1020 precision tubes, 20mm OD x 2mm WT, for instrumentation lines. Tube quality and dimensions were fine, but some end caps came loose during transit causing minor surface scratches on about 10% of pieces. Reported the issue and they provided a credit note within a week. Subsequent trial shipment had improved packing.

William Taylor

Australia

2025-03-10

Solid Precision Tubing for Bearing Sleeve Application

We received 2 tons of E355 phosphated precision seamless tube, 80mm OD x 12mm WT, for bearing sleeve machining. Phosphate coating was uniform and aided our downstream machining. OD tolerance was within ±0.12mm — acceptable per EN 10305-1 but not as tight as some of their smaller diameter products. Overall good value considering the FOB pricing and included 3.1 certification.

Carlos Silva

Brazil

2025-04-01

Good Value Precision Tubes for Shock Absorber Production

Ordered 8 tons of SAE 1045 cold-drawn tubes, 42mm OD x 4mm WT, for automotive shock absorber housings. Mechanical properties tested at 620 MPa tensile strength, comfortably above minimum. Compared quotes from 5 suppliers and this offered the best balance of price and documented quality. Delivery took 32 days which was within the quoted window but slightly longer than we hoped for a stock grade.