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Product name: GB 9948 Material10#20# 12CrMo 15CrMo 12Cr1MoV Petroleum Cracking Seamless Steel Tubes Out Diameter: 3~500mm Wall Thickness: 0.5~50mm Application: It is used for the seamless steel tubes for furnace,heat exchangers, Petroleum Cracking etc. Table1 The Tolerances of Outer Diameter and Wall Thickness Unit:mm Sort Code Manufacuring Method Nominal Size Tolerances Common Level High Level W-H Hot Rolling (Extrusion) Outer Diameter D ≤54 ±0.50 ±0.30 ＞54~325 ±1%D ±0.75%D

GB9948 20# Alloy Carbon Pipe Petroleum Cracking Seamless Steel Tube Production Method of Steel: High quality carbon sructural steel and alloy structural steel should be handled through electric arc furnace and refining outside the furnace and vacuum refining processing.,also can be producetd by electroslag heavy solvent method.Stainless steel should use electric arc furnace and refining outside the furnace or oxygen converter refining outside the furnace,also can be producetd

GB/T9808 STM-R780 High Straightness Seamless Steel Tubes for Drilling our products apply to geological core drilling,water well drilling,hydrogeoligical drill,casing material for engineering drilling,core tube material and casing coupling Seamless Steel Tubes,ordinary drill pipe material and drill pipe joint Seamless Steel Tubes,rope coring drill pipe material and drill pipe joint Seammless Steel Tubes,drill collar material and drill collar lock joint Seamless Steel Tubes.

GB6479 Seamless Steel Tubes For High Pressure Chemical Fertilizer Equipments Seamless Steel Tubes Steel Grade/Steel Material:10#, 20#, 45#, 12CrMo Steel pipe standard:GB6479 size: OD:10.00—700mm WT:1.00—60mm Length: 5.8m, 6m,or as required. Production Processs: RAW MATERIAL ↓ INCOMING INSPECTION ↓ STORAGE → CUTTING→HAMMERING → PICKING LUBRICATION → CLEANING → PHOSPHORI CLEAN ↓ ENDS CUTTING←STRAIGHTENING←HEAT TREATMENT↔MIDDLLE CHECK↔ COLD DRAWING ← LUBRICATING ↓ FINAL

GB18248 34CrMo4 30CrMnSiA Seamless Steel Tubes for Gas Cylinder Products Description: GB18248 34CrMo4 30CrMnSiA Seamless Steel Tubes for Gas Cylinder Well-finished inside and outside surface. Alloy Steel tubes and pipes. Standard: GB18248 JIS G3429 Applications: for High Pressure Gas Cylinder Size Range: OD: 5-420mm WT: 0.5-50mm Length:4-12m Relevant standard: KS D3573 The Steel Refining Method: The steel is Killed steel refined in electric furance or oxygen converter. The

GB5310 20G 20MnG 20MoG High Pressure Seamless Steel Boiler Pipes Standard:Seamless Steel Tubes and Pipes for High Pressure Boiler Steel Grade/Steel Material/Steel Number: Grade Chemical Analysis % C Si Mn Cr Mo V P S 20G 0.07- 0.23 0.17- 0.37 0.35- 0.65 - - - ≤0.025 ≤0.015 20MnG 0.17- 0.23 0.17- 0.37 0.70- 1.00 - - - ≤0.025 ≤0.015 25MnG 0.22- 0.27 0.17- 0.37 0.70- 1.00 - - - ≤0.025 ≤0.015 15MoG 0.12- 0.20 0.17- 0.37 0.40- 0.80 - 0.25- 0.35 - ≤0.025 ≤0.015 20MoG 0.15- 0.25 0

Seamless Steel Tubes and Pipes for High Pressure Boiler GB 5310 Spec: Material:20G 20MnG 25MnG Size Range:OD:4-1200mm WT:0.3-200mm General Length:4-12.5m Tolerance: According to the following tables or customers’ request. Producing method Size Tolerance General High grade Hot rolling (extrude) D 54~325 S≤35 ±0.75% ±0.5% S>35 ±1% ±0.75% >325 ±1% ±0.75% S ≤4.0 ±0.45 ±0.35 >4.0~20 ±12.5%-10% ±10% >20 D25.4~40 ±0.20 _ >40~50 ±0.25 _ >50~60 ±0.30 _ >60 ±0.5% _ S ≤3.0 ±0.3 ±0.2 &g

Products Description: GB/T 8163 10 20 Carbon Steel Seamless Steel Pipe Tube for Liquid Service Steel Grade/Steel Material: Mechanical Properties(longitudinal): Steel Grade Tensile Strength MPa Yield Strength MPa Elongation % s≤16 s＞16 no less than 10 335-475 205 195 24 20 410-550 245 235 20 Q295 430-610 295 285 22 Q345 490-665 325 315 21 Delivery Condition: hot rolling, annealing, normalizing Size Range: OD: 5.0-660mm WT:0.5-60mm Length: max 12000mm Our regularproduction size

ASTM A179 Cold-Drawn Low-Carbon Seamless Steel Tube for Heat-Exchanger and Condenser is widely used for Marine boiler and superheater and Ⅰ, Ⅱ pressure piping with seamless steel tube manufacturing. This kinds of steel pipe is made by material of 320/360/410/460/490 according to the GB/T 5312 standard. Size: Outer Diameter: 6-1000 mm,Wall Thickness: 1- 80 mm,Length :1-12m or as your request Application:Manufacture of boilers or superheater. Material:10#.20#.16Mn.A106(B,C)