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GB/T 13793 Longitudinal Electric Resistance Welde Longitudinal Electric Resistance Welded Hot Dip Galvanized Steel Tubes Application:Suitable for mechanical, construction and other structural purposes, and the straight seam welded steel pipe with an outer diameter of not more than 711mm, can also be applied to general welded steel pipe for fluid transportation size:L--4~12m OD--5~711mm WT--0.5~5.5mm Grade:10,20,Q195,Q215,Q213,Q275 Manufacture method:The steel pipe shall be

GB/T 28413 SA178 Welded Carbon Steel Pipes For Boiler and heat exchangers Chinese Technical Standard GB/T 28413 Welded Carbon Steel Pipes For Boiler and Heat Exchangers Steel Grade/Steel Material/Steel Number: 10# 20# Q245R Q345R Q370R Size Range: OD: 6-127mm Min WT:0.9-9.1mm Length:4-12m,as customer’s requirement Mechanical Properties: Grade Lower yield strength Rel/N/mm² No less than Tensile strength R. /N/mm² No less than Extensibility after fracture A/% No less than T≤16

Welded Steel Pipes for Low Pressure Liquid Delivery GB/T 3091 Spec: Material:Q195 Q215A/B Q235A/B Q295A/B Q345A/B equivalent to steel grade st33 Cr.B Cr.58 Cr.D DIN S185 SS330 SS400 etc Size Range:OD:3-420mm WT:0.5-50mm General Length:3-12m Tolerance: According to the following tables or customers’ request. Characteristic: Weight coefficient of galvanized coat Processing: Steel pipe shall be processed eith anyone of longitudinal-seam high-frequency electrical resistance

TORICH GB/T24187 BHG1 Precision Single Welded Steel Tubes In Condenser Table1 The type, state and code of the steel tube surface Type State Code Bright Surface No coating on the inner and outer surface of steel pipe SL Copper plated surface Copper plating on the outer surface of steel tube Cu Galvanized surface Galvanized or zinc alloy on the outer surface of steel pipe Zn Double-sided copper plating surface The inner and outer surfaces of the steel pipe are plated with

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

TORICH GB/T24187 BHG1 Precision Single Welded Steel Tubes In Condenser Spec: Material:C Si Mn P S Size Range:OD:3.18-18mm WT:0.5-1.2mm General Length:1-200m Tolerance: According to the following tables or customers’ request. Table 1 Outer diameter, wall thickness and theoretical weight OD/mm WT/mm 0.30 0.40 0.50 0.60 0.65 0.70 0.80 0.90 1.00 1.30 theoretical weight /(kg/m) 3.18 0.0213 0.0274 0.0330 4.00 0.0274 0.0355 0.0432 0.0503 4.76 0.0330 0.0430 0.0525 0.0616 0.0659 0

TORICH GB/T3091 Q195 Welded Steel Pipes For Low Pressure Liquid Delivery sizes: O.D : 5mm-420mm W.T : 0.5mm-50mm Length:3000mm-12000mm Steel material: Q195,Q215,Q215B,Q235A,Q235B,Q235,Q345,Q345B Application: Carbon steel pipe use for construction ,building filed , low pressure liquid, water, gas, oil, line pipe Surface Treatment: Galvanized,Oiled,Black Painted (varnish coating),corrosion resistant coating, Anti corrosion coating Technique: Electronic Resistance Welded (ERW )

GB/T 14291 TORICH Welded steel tubes for mine liquid service GB/T 14291 TORICH Welded steel tubes for mine liquid service Size Range: OD:4-1200mm WT:0.3-200mm Length: 4000mm-12000mm Characteristic: Good OD and ID tolerance controlled to Technical Standard Stable quality TABLE 2 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

GB/T 14291 TORICH Welded steel tubes for mine liquid service GB/T 14291 TORICH Welded steel tubes for mine liquid service Size Range: OD:4-1200mm WT:0.3-200mm Length: 4000mm-12000mm Characteristic: Good OD and ID tolerance controlled to Technical Standard Stable quality TABLE 2 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