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GB/T 14291 Q235A / Q235B Welded Steel Tube for Mine Liquid Service

Minimum Order Quantity : 2 Tons Price : USD 400-700 Ton
Packaging Details : In bundles in wooden box Delivery Time : 35-45 Days
Payment Terms : L/C, D/A, D/P, T/T, Western Union, MoneyGram Supply Ability : 6000 Tons per Year
Place of Origin: China Brand Name: TORICH
Certification: ISO 9001 ISO 14001 TS 16949 EN 10204.3.1 LR KR Model Number: GB/T 14291

Detail Information

Product Name: GB/T 14291 Welded Q235A/Q235B Steel Tubes For Mine Liquid Service Material: Q235A,Q235B,Q295A,Q295B,Q345A,Q345B
Type: Welded Steel Tube Surface: Oiled
Usage: Mine Liquid Service Shape: Round
Length: 4-12m OD: 21.3-660mm
WT: 2.5-14mm
High Light:

welding steel tubing

,

electric resistance welded steel tube

Product Description

GB/T 14291 Welded Q235A/Q235B Steel Tubes for Mine Liquid Service

Application:Mine wind, drainage, drainage gas pressure and the pulp conveying with straight seam welded steel pipe

Size:L--4~12m

OD--21.3-660mm

WT--2.5-14mm

Grade:Q235A,Q235B,Q295A,Q295B,Q345A,Q345B

Manufacture method:High-frequency resistance welding

Delivery state:Steel pipe should be straight seam tube flat end light delivery.The supply and demand both sides talks things over, can also according to the weld heat treatment delivery status or other status.

 

TABLE 1 Allowable deviation of outer diameter and wall thickness

Unit: millimeter

Nominal outside diameter D Allowable deviation of outer diameter Permissible deviation of wall thickness
D≤48.3 ±0.50 ±10%S
48.3<D≤273 ±1%D
D>273 ±0.75%D

 

TABLE 2 Mechanical Property

Grade

Tensile strength

 

Lower yield strength

Elongation A%

Not less than

D≤168.3 D>168.3
Q235A,Q235B 375 235 15 20
Q295A,Q295B 390 295 13 18
Q345A,Q345B 470 345 13 18
Note : Tensile test arbitration time is based on longitudinal sample.

 

TABLE 3 Inspection items, test methods and sampling number of steel pipes

NO Inspection project Sampling method and test method Sampling quantity
1 chemical composition GB/T 20066,GB/T 223,GB/T 4336 One each furnace(canister)
2 Tensile test GB/T 228,GB/T 2975 One each batch
3 Tensile test GB/T 241 One by one
4 Ultrasonic examination GB/T18256 One by one
5 Eddy current flaw detection GB/T 7735 One by one
6 Bending test GB/T 244 Two per batch
7 Flattening test GB/T 246 Four each roll

 

Table4 Outer Diameter,Wall Thicknes,Theoretical Weight and Test Pressure

Norminal Outer Diameter(D)/mm Norminal Wall Thickness(S)/mm Theoretical Weight/(kg/m) Test Pressure/MPa
Q235A,Q235B Q295A,Q295B Q345A,Q345B
21.3 2.5 1.16 15 15 15
21.3 3 1.35 15 15 15
21.3 3.5 1.54 15 15 15
25 2.5 1.39 15 15 15
25 3 1.63 15 15 15
25 3.5 1.86 15 15 15
25 4 2.07 15 15 15
26.9 2.5 1.50 15 15 15
26.9 3 1.77 15 15 15
26.9 3.5 2.02 15 15 15
26.9 4 2.26 15 15 15
31.8 2.5 1.81 15 15 15
31.8 3 2.13 15 15 15
31.8 3.5 2.44 15 15 15
31.8 4 2.74 15 15 15
33.7 2.5 1.92 15 15 15
33.7 3 2.27 15 15 15
33.7 3.5 2.61 15 15 15
33.7 4 2.93 15 15 15
38 2.5 2.19 15 15 15
38 3 2.59 15 15 15
38 3.5 2.98 15 15 15
38 4 3.35 15 15 15
40 2.5 2.31 15 15 15
40 3 2.74 15 15 15
40 3.5 3.15 15 15 15
40 4 3.55 15 15 15
42.4 2.5 2.46 15 15 15
42.4 3 2.91 15 15 15
42.4 3.5 3.36 15 15 15
42.4 4 3.79 15 15 15
48.3 2.5 2.82 14.6 15 15
48.3 3 3.35 15 15 15
48.3 3.5 3.87 15 15 15
48.3 4 4.37 15 15 15
51 2.5 2.99 13.8 15 15

 

GB/T 14291 Q235A / Q235B Welded Steel Tube for Mine Liquid Service 0

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