Project Description

Commitment to You

We are committed to integrate steel resources in china and serve the global steel market. We have 15+ years of experience in steel researching, production, managing and sales.

Our ability to purchase materials directly from leading mills will give you the competitive edge. Any Questions Just Call +86-731-89903933

Applications:

High Precision Cold Rolled Seamless Steel Tube is used in automotive industry, and in the occasion where the high accuracy, brightness, cleanness of the tube are required.

Main Features：

  1. Inner and outer walls of tube have high accuracy.
  2. Excellent brightness.
  3. No oxidization after heat treatment
  4. High cleanness inside tube.

Quality Standards:

  1. DIN 2391 Seamless Precison Steel Tubes
  2. BS6323 Specification for Seamless and Welded Steel Tubes for Automobile, Mechanical and General Engineering Purposes
  3. ASTM A519 Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing

Steel Grades:

  1. DIN Standard: St35, St52
  2. BS Standard: CFS 4, CFS 5, CFS 10
  3. ASTM Standard: 1020, 1045, 4130

Chemical Composition(%):

Grade C Si Mn P S Cr Mo
St 35 (DIN1.0308) 0.17 max 0.35 max 0.40 min 0.025 max 0.025 max / /
St 52 (DIN1.0580) 0.22 max 0.55 max 1.60 max 0.025 max 0.025 max / /
CFS 4 0.25 max 0.35 max 1.20 max 0.050 max 0.050 max / /
CFS 5 0.23 max 0.50 max 1.50 max 0.050 max 0.050 max / /
CFS 10 0.26 max 0.35 max 0.80 max 0.050 max 0.050 max 0.80-1.20 0.15-0.30
1020 0.18-0.25 / 0.30-0.60 0.040 max 0.050 max / /
1045 0.43-0.50 / 0.60-0.90 0.040 max 0.050 max / /
4130 0.28-0.33 0.15-0.35 0.40-0.60 0.040 max 0.040 max 0.80-1.10 0.15-0.25

Size Range:

  1. Outer Diameter: 5mm-220mm
  2. Wall Thickness: 0.5mm-25mm

Delivery Conditions:

  1. +C (BK) Hard. No final treatment after final cold rolling.
  2. +LC (BKW) Soft. Final heat treatment is followed by a suitable drawing pass (limited reduction of area).
  3. +SR (BKS) Stress Relieved. After final cold rolled, the tubes are stress relieved in a controlled atmosphere.
  4. +A (GBK) Annealed. After final cold rolled, the tubes are annealed in a controlled atmosphere.
  5. +N (NBK) Normalized. After final cold rolled, the tubes are normalized in a controlled atmosphere.

Mechanical Properties( T=20°C if not differently stated ):

Grades Delivery Conditions Tensile Strength Rm (Mpa) Yield Strength R2 (Mpa) Elongation in the longitudinal direction Al (%)
St 35 +C (BK) 480 min / 6 min
St 35 +LC (BKW) 420 min / 10 min
St 35 +SR (BKS) 420 min 315 min 14 min
St 35 +A (GBK) 315 min / 25 min
St 35 +N (NBK) 340-470 235 min 25 min
St 52 +C (BK) 640 min / 4 min
St 52 +LC (BKW) 580 min / 7 min
St 52 +SR (BKS) 580 min 420 min 10 min
St 52 +A (GBK) 490 min / 22 min
St 52 +N (NBK) 490-630 355 min 22 min
E235 +C (BK) 390 min / 7 min
E235 +A (GBK) 315 min / 25 min
E235 +N (NBK) 340-480 235 min 25 min
E355 +C (BK) 540 min / 5 min
E355 +A (GBK) 450 min / 22 min
E355 +N (NBK) 3490-630 355 min 22 min

Package:

  1. Bundle Packing.
  2. Plain end or vanished as per customer’s request.
  3. Wrapped in waterproof paper.
  4. Sackcloth with several steel strips.
  5. Pack in heavy tri-wall boxes.

Mill Test Certificate:

MTC is issued in accordance with EN 10204.

Experienced 15+ Years

Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets.

We Can Supply Follows Products with High Quality:

  1. Cold Rolled Steel Tube
  2. Cold Drawn Steel Tube
  3. Hollow Bar
  4. Honed Tube
  5. Plated Tube
  6. Plated Bar
  7. Boiler Tube

All Products According Quality Standard Strictly:

  1. ASTM: ASTM A519, ASTM A513.
  2. JIS:JIS G3441, JIS G3445, JIS G3466, JIS G3459.
  3. DIN: DIN1626, DIN1629, DIN2391, DIN2393, DIN2448, DIN2458.
  4. EN: EN10305.
  5. BS: BS6323.

Wide Range of Pipes to Fit Your Industry:

  1. OD from 5mm to 820mm.
  2. Wall Thickness from 0.1 to 100mm.
  3. Length up to 50mtr per pc.

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