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

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
Grade	Tensile strength	Lower yield strength	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
Norminal Outer Diameter(D)/mm	Norminal Wall Thickness(S)/mm	Theoretical Weight/(kg/m)	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

Product Tags:

welding steel tubing

electric resistance welded steel tube

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

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