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

Application：

This is one of the most commonly used alloy quenched and tempered steel, used in manufacturing bear under moderate load and medium speed operating conditions of mechanical parts, such as automotive steering knuckles, gears and rear axle on the machine shaft, worm, spline shaft, top sets, and also may be quenched after high-frequency surface hardening for manufacturing a high surface hardness and wear resistance without great impact parts. Such as gears, sleeves, shafts, spindles, mandrels, pins, connecting rod bolt, intake valves, etc.. It can also be hardened, medium or low temperature tempering. And it can be manufactured heavy duty parts, and is suitable for manufacturing Oxycarbonitride permeation treatment of various transmission parts, such as large diameter and good low temperature toughness requirements gears and shafts .

Standard:

  1. JIS G3441 Alloy Steel Tubes for Machine Purposes
  2. EN10297 Seamless Circular Steel Tubes for Mechanical and General Engineering Purposes
  3. ASTM A519 Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing

Steel Grades:

  1. JIS G3441: SCR440.
  2. EN10297: 41Cr4 / 1.7035.
  3. ASTM A519: 5140.

Competitive Advantage:

  1. High strength.
  2. High tenacity.
  3. Good hardenability.
  4. High resistance to thermal properties.
  5. Competitive price.
  6. Fast production leadtime.
  7. All the material are inspected with 3 times to meet the highly standards.

Sizes Range:

OD:10.2mm-810mm, WT:1.6mm-100mm

Chemical Composition(%):

Grades C Si Mn P S Cr Ni
40Cr 0.37-0.44 0.17-0.37 0.50-0.80 0.025 max 0.025 max 0.80-1.10 0.25 min
SCR440 0.37-0.44 0.15-0.35 0.55-0.90 0.03 max 0.03 max 0.85-1.25 0.25 min
41Cr4 0.38-0.45 0.40 max 0.60-0.90 0.035 max 0.035 max 0.90-1.20 /
5140 0.38-0.43 0.15-0.35 0.70-0.90 0.04 max 0.04 max 0.70-0.90 /
530M40 0.36-0.44 0.10-0.40 0.60-0.90 0.035 max 0.040 max 0.90-1.20 /

Outer Diameter Tolerances

+/-1%, or +/-0.5mm (Chose the bigger one)

Wall Thickness Tolerances

Scope of Outer Diameter Ratio of Wall Thickness and Outer Diameter (WT/OD) Tolerance
102mm max / +/12.5% or +/-0.4mm (Chose the bigger one)
102mm min 0.05 max +/15% or +/-0.4mm (Chose the bigger one)
102mm min 0.05-0.10 +/12.5% or +/-0.4mm (Chose the bigger one)
102mm min 0.10 min (-10%, +12.5%)

Delivery Conditions

  1. Hot Rolled only.
  2. Stress Relieved.
  3. Annealed.
  4. Normalized.
  5. Quenched and Tempered.

Surfaces Conditions

  1. Black surface with oxygen skin.
  2. Grinded for external or internal surface, or external and internal surface.
  3. Peeled for external or internal surface, or external and internal surface.

Mechanical Properties (Quenched and Tempered) (T=20°C if not differently stated)

Wall Thickness (mm) Tensile Strength (Mpa) Yield Strength(Mpa) Elongation (Longitudinal) (%) Elongation (Transverse) (%) Notch impact energy (Longitudinal) [J] Notch impact energy (Transverse) [J]
8 max 1000 max 800 min 11 min 9 min 30 min /
8-20 900 max 660 min 12 min 10 min 35 min 22 min
20-50 800 max 560 min 14 min 12 min 35 min 22 min

Recommended Heat Treatment Temperatures

Heat Treatment Temperatures (°C)
Annealing 680-720
Normalizing 840-880
Austenitizing 820-860
Tempering 540-680

Tube ends:

The hollow bar comes with square cut and deburred ends.

Certification:

The hollow bar is supplied with 3.1.B inspection certificate,according to the standards EN 10204 and ISO 10474.

Identification and Marking:

  1. The hollow bar is marked in indelible ink, the details being repeated along the entire length of each tube and on a label, as follows:
  2. Manufacturer’s trademark – manufacturing standard – dimensions -steel grade – supply condition – cast no. – item number.

Packaging:

The hollow bar comes in strapped bundles. The minimum weight of each bundle is 2000kg; the maximum bundle weight being 5000kg, with a minimum of 4 pieces

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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