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GB/T 13296 TORICH seamless stainless steel tubes for boiler and heat exchanger Size Range: OD:6-159mm WT:1-14mm Length: 3000mm-12000mm Characteristic: Good OD and ID tolerance controlled to Technical Standard Stable quality Steel grade and chemical composition Number Steel grade Chemical Composition % C Si Mn P S Ni Cr Mo Ti 1 0Cr18Ni9 ≤0.07 ≤1.00 ≤2.00 ≤0.035 ≤0.030 8.00~ 1.00 17.00~ 19.00 — — 2 1Cr18Ni9 ≤0.15 ≤1.00 ≤2.00 ≤0.035 ≤0.030 8.00~ 10.50 17.00~ 19.00 — — 3 1Cr19Ni9

Produce Name: A53 - A369 ST35 - ST52 Elliprtical Steel Pipes Oval Special Steel Pipe Oval Special Steel Tube are produced with Material: 10#-45# A53-A369, ST35-ST52, Q195, Q235 , Q345 The sizes of Flat sided Oval Special Steel Tube are as follow: Outer Diameter: 3-420mm (Diameter and wall thickness could be at customer's request.) Thickness: 0.5-50mm Characteristic: Good concentricity Good surface quality Good OD and ID tolerance High Precision Stable quality Smooth Roughness

GB/T 20409 Multi-Rifled Seamless Steel Tubes for High-Pressure Boiler Spec: Material:20G , 20MnG , 25MnG , 12CrMoG , 15CrMoG Size Range:OD:4-1200mm WT:0.3-200mm General Length:8-12m Tolerance: According to the following tables or customers’ request. Longitudinal mechanical properties of internal screw tubes at room temperature Number Grade tensile strength / MPa(N/) Lower yield strength /MPa((N/) Elongation A/% Impact energy /J Not less than 1 20G 410~550 245 24 35 2 20MnG

GB6479 Seamless Steel Tubes for High-Pressure Chemical Fertilizer Equipments Material:10# 20# Q345B 12CrMo 15CrMo 12Cr2Mo 12Cr5Mo ASTM 1010/1020/179/192 st37/35.4/35.8/45-8 Size Range:OD:3-420mm WT:0.5-50mm General Length:4-12m Tolerance: According to the following tables or customers’ request. Characteristic: Good concentricity Good surface quality Good OD and ID tolerance High Precision Stable quality Smooth Roughness TORICH QUALITY ASSURANCE Characteristic:Technical

GB/T3093 10A 20A Q345A High Pressure Seamless Steel Tubes For Diesel Engine If you have been on a pursuit of the ultimate quality, then look no further than this. We as a Manufacturer, Exporter and Supplier of Seamless Steel Pipes are passionate for about delivering nothings short of excellence. We put Seamless Steel Pipes under intense quality checks tested against numerous parameters to ensure that the promising quality that we offer complies with the international quality

TORICH GB/T9948 12CrMo Seamless Steel Tubes For Petrleum Cracking 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 ＞325 ±1%D - Wall Thicknass S ≤20 +15%S -10%S ±10%S ＞20 +12.5%S -10%S ±10%S Hot Expand Outer Diameter D All ±1%D Wall Thicknass S All ±15%S W-C Cold Drawn(Rolling) Outer Diameter D ≤25.4

Carbon and Carbon-Manganese Steel Seamless Steel Tubes and Pipes for Ship GB/T 5312 Spec: Material:10# 20# Q345B 12CrMo 15CrMo 12Cr2Mo 12Cr5Mo ASTM 1010/1020/179/192 st37/35.4/35.8/45-8 Size Range:OD:3-420mm WT:0.5-50mm General Length:4-12m Tolerance: According to the following tables or customers’ request. Producing Method:hot roling(extrude pressing,expansion) or cold drawn(rolling) Technical Delivery Conditions:Steel tubes shall be delivered after heat treatment in the way

Carbon and Carbon-Manganese Steel Seamless Steel Tubes and Pipes for Ship GB/T 5312 Spec: Material:320/360/410/460/490 Size Range:OD:4-1200mm WT:0.3-200mm General Length:3-12m Tolerance: According to the following tables or customers’ request. Production Method Size(mm) Tolerance Hot Rolling(Extrusion) OD ≤159 ±1.0%(min.±0.50mm) >159 ±1.25% WT ≤20 +15%(min.+0.45mm) -10%(min. -0.30mm) >20 ±10% D≥351 ±15% Cold Drawn OD ≤30 ±0.20mm 30~50 ±0.30mm >50 ±0.8% WT 1.5~3 +12.5% -10% >3

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