products

O.D. 6 - 350mm Cold Drawn / Cold Rolled Precision Seamless Steel Tube 20# 45

Basic Information
Place of Origin: China
Brand Name: Torich
Certification: ISO9001
Model Number: GB/T3639-1983
Minimum Order Quantity: 1000kg
Price: 600-1000 USD per ton
Packaging Details: In bundles in wooden box
Delivery Time: 3-4 weeks
Payment Terms: L/C, T/T
Supply Ability: 50000tons per year
Detail Information
High Light:

precision seamless pipe

,

precision pipes and tubes


Product Description

Cold drawn or cold-rolled precision seamless steel tubes

 

Relative standard :

GB/T222 permissible tolerance for chemical composition of steel products.

GB/T223.5 Steel and iron-Determination of acid-soluble silicon and total silicon content-Reduced molybdosilicate spectro photometric method(GB/T223.5-2008,ISO 4829-1:1986,ISO 4829-2:1988,MOD)

 

Mechanical properties

Steel grade 10# 20# 35# 45# Q345B

 

Steel grade deliver conditions
+C +LC +SR +A +N
Rm/Mpa A/% Rm/Mpa A/% Rm/Mpa ReH/Mpa A/% Rm/Mpa A/% Rm/Mpa ReH/Mpa A/%
No less than
10 430 8 380 10 400 300 16 335 24 320-450 215 27
20 550 5 520 8 520 375 12 390 21 440-570 255 21
35 590 5 550 7       510 17 ≥460 280 21
45 645 4 630 6       590 14 ≥540 340 18
Q345B 640 4 580 7 580 450 10 450 22 490-630 355 22

 

 

Deliver condition:

Cold working/Hard condition:+C

No heat treatment after the final cold working process.

Cold working/Soft condition:+LC

After the final treatment there is a suitable cold working process

Stress relieving annealed conditio:+SR

After the final cold working process there is a stress relief heat treatment in a controlled atmosphere

Annealed condition:+A

After the final cold working process the tubes are fully annealed in a controlled atomosphere.

Normalised condition:+N

After the final cold working operation the tubes are normalized in a controlled atomosphere.

 

 

The permissible tolerances of the internal and external diameter unit:mm

 

Wall thickness(S)/extrernal diameter Permissible tolerance
S/D≥1/20 According to the specified value of the table 1
1/40≤S/D<1/80 According to 1.5 times of specified value of the table 1
S/D<1/40 According to double of specified value of the table 1

 

 

Length is 2000-12000mm Fixed length and multiple length is available.

Tolerance for length , a)the length ≤5000mm +5,0mm

B)the length >5000mm +10,0mm

 

Every multiple length should leave incision margin according to the following requirement for the steel tubes delivered by multiple length.

  1. External diameter≤159mm:5mm~10mm
  2. External diameter>159mm:10mm~15mm

 

Curvature:≤3.0mm/m

The steel tubes’ total length curvature external diameter ≥16mm

  • ReH≤500Mpa,≤0.15%L
  • ReH>500Mpa,≤0.20%L

Contact Details
Lily Zhang

Phone Number : +8618958208557

WhatsApp : +8613736164628