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| Brand Name: | TORICH |
| Model Number: | GB/T 3639 |
| MOQ: | 5 Ton |
| Price: | negotiable |
| Payment Terms: | L/C, D/A, D/P, T/T, Western Union, MoneyGram |
| Supply Ability: | 50000 Ton/Year |
Seamless Steel Tubes for Precision Applications GB/T 3639
Spec:
Material:10# 20# 35# 45# Q345B Equivalent to grade SAE 1010 1020 st35.4 st 37 st35.8 c22 c35 c45 etc.
Size Range:
OD:3-420mm
WT:0.5-50mm
General Length:Length is 2000-12000mm Fixed length and multiple length is available.
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 |
Tolerance:
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 |
Producing Method:cold-drawn or cold-rolled
Technical Delivery Conditions:
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.
Widely used in the field of:Hydraulic System, Auto Parts,Jack Lifting,Precision Machinery etc.
Product Images:
