BS 6323-4 CFS3 Cold Finished Seamless Steel Tubes 6-280mm OD

Price Negotiable

Price: 800-1200 USD/Ton

MOQ: 1Ton

Delivery Time: 20-30days upon products

Brand: TORICH

Product Description

BS 6323-4 CFS3 Cold Finished Seamless Steel Tubes For Automotive Industry

Material
Carbon steel cold-finished seamless tubes, manufactured according to the BS 6323-4 standard (Part 4), specifically for automotive, mechanical, and general engineering uses.

Specifications

Standard: BS 6323-4, Part 4 – cold-finished seamless tubes
Seamless cold finishing; residual lubricant permissible unless specified
Delivery conditions: BK (hard), BKW (soft), GBK (annealed), GZF (annealed & de-scaled), NBK (normalized), NZF (normalized & de-scaled)
Typical size range: OD up to ~230 mm (per standard); supplier production range: 6–280 mm OD, 1–30 mm wall, up to 12 m length

Chemical Composition

C ≤ 0.20%, Si ≤ 0.35%, Mn ≤ 0.90%, P ≤ 0.050%, S ≤ 0.050% (CFS3)
Variant CFS3Aa: Mn 0.60–1.00%, Si 0.10–0.35%

Mechanical Properties

Tensile strength: ~480 MPa (typical)
Elongation: ~6% (typical)

Comparable Grades Summary

Grade	C	Si	Mn	P	S	Tensile MPa	Elongation %
CFS3	≤0.20	≤0.35	≤0.90	≤0.050	≤0.050	~480	~6
CFS3Aa	≤0.20	0.10–0.35	0.60–1.00	≤0.050	≤0.050	–	–
CFS4	≤0.25	≤0.35	≤1.20	≤0.050	≤0.050	~410	~22
CFS5	≤0.23	≤0.50	≤1.50	≤0.050	≤0.050	–	–
HFS3	≤0.20	≤0.35	≤0.90	≤0.050	≤0.050	–	–

Key Features
High precision and tight tolerances from cold drawing; good mechanical strength; corrosion-resistant options with surface treatments; multiple finishing options like phosphate, galvanizing, or varnish.

Standards & Certifications

Complies with BS 6323-4 and BS 6323-1
Can be certified per EN 10204 Type 3.1/3.2
Additional compliance (IBR, NACE, HIC) available

Applications
General automotive components, mechanical and general engineering parts. In automotive uses: fuel and CNG lines, structural shafts, absorber parts, and other precision mechanical elements.