Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

Structural steel pipe,Structural seamless pipe


Seamless pipe seamless structure for general structural and mechanical structure. Because a variety of seamless steel tubes into the different uses.

Chinese standard name StandardTitle in Chinese: structure seamless steel pipe, standard English name: Seamless steel tubes for structural purposes

 
Mild Steel Structural Pipes A106GR. B 

OD: 21-610mm 
 
WT: 2-42mm 
 
Length: 12m maximum 
 
Standards: EN 10219/10216/10210, ASTM A53, A106, API5L, JIS G3444, DIN17175/1629/2448/2440 
 
Steel Grades: S235-S355, L235-L355, P195-P460, GR. A, GR. B, X42 ~ X70, STK400, STK500, SS400, ST42 ST45 
 
Process Method: Hot finish and hot expand and cold draw 
Structural steel pipe,Structural seamless pipe
chemical composition (GB / T8162)
Standard
Trademark
Chemical Composition
C
Si
Mn
P, S
Cu
Ni
Mo
Cr
GB / T8162
10
0.07 to 0.14
0.17 to 0.37
0.35 to 0.65
≤0.035
≤0.25
≤0.25
/
≤0.15
20
0.17 to 0.24
0.17 to 0.37
0.35 to 0.65
≤0.035
≤0.25
≤0.25
/
≤0.25
35
0.32 to 0.40
0.17 to 0.37
0.50 to 0.80
≤0.035
≤0.25
≤0.25
/
≤0.25
Forty five
0.42 to 0.50
0.17 to 0.37
0.50 to 0.80
≤0.035
≤0.25
≤0.25
/
≤0.25
16Mn
0.12 to 0.20
0.20 to 0.55
1.20 to 1.60
≤0.035
≤0.25
≤0.25
/
≤0.25
12CrMo
0.08 to 0.15
0.17 to 0.37
0.40 to 0.70
≤0.035
≤0.25
≤0.30
0.40 to 0.55
0.40 to 0.70
15CrMo
0.12 to 0.18
0.17 to 0.37
0.40 to 0.70
≤0.035
≤0.25
≤0.30
0.40 to 0.55
0.80 to 1.10
12Cr1MoV
0.08 to 0.15
0.17 to 0.37
0.40 to 0.70
≤0.035
≤0.25
≤0.30
0.25 to 0.35
0.90 to 1.20 [1]

dimensional tolerances

Standard Diameter tolerance `Thick tolerance
GB / T 8162 D <50 ± 0.50mm S <4mm ± 12.5%
D≥50 ± 1% 4-20mm + 15 / -12.5%
S≥20mm ± 12.5%
DIN1629 D50 ± 0.50mm S2Sn + 15 / -10%
D48.3D48.3 ± 1% 2SnS4Sn + 12.5 / -10%
S4Sn ± 9%
ASTM A53 D <48.3 ± 0.4 / -0.79mm ± 12.5%
D≥48.3 ± 1%
ASTM A106 D <48.3 ± 0.4 / -0.79mm ± 12.5%
D48.3-114.3 ± 0.79mm
D≥114.3 ± 1.59 / -0.79mm

Mechanical Properties

Standard Steel grade Tensile strength (MPa) Yield strength (MPa) Elongation
<16mm 16-30mm
GB / T 8162 10 335 205 195 Twenty four
20 390 245 235 20
35 510 305 295 17
Forty five 590 335 325 14
16Mn 490 325 315 Twenty one
DIN 1629   <16mm > 16mm  
ST35 345-460 235 225 25
ST45 440-550 255 245 Twenty one
ST55 540-645 295 285 17
ST52 490-630 355 345 Twenty two
ST45 590-730 335 325 14
ASTM A53 A 330 205  
B 415 240
ASTM A106 A 330 205  
B 415 240
C 485 275

7Pipe theoretical formula

W (kg / m) = 0.02466 * wall thickness * (OD - Wall Thickness)

 


Table of Contents

  1. Brief introduction
  2. structure seamless steel pipe category
  3. Process
  4. Chemical composition (GB / 8162-2008)
  5. Dimensional tolerances
  6. Mechanical Properties
  7. Pipe theoretical formula
  8. Use

1Introduction

Chinese standard name StandardTitle in Chinese: structure seamless steel pipe

English Standard Name: Seamless steel tubes for structural purposes

Seamless pipe seamless structure for general structural and mechanical structure

2structure seamless steel pipe category

Carbon structural steel (GB / 8162-2008)

Such structures or open hearth steel smelting generally consists of a converter, the main raw material for iron plus scrap, steel, sulfur and phosphorus content than high-quality carbon structural steel, usually sulfur ≤0.050%, P ≤0.045%. Steel from raw materials into other alloying elements such as chromium, nickel, copper is generally not more than 0.30%, according to the composition and performance requirements, such structural steel grades by the Q195, Q215A, B, Q235A, B, C, D , Q255A, B, Q275 and other steel-level representation.

Note: "Q" is the yield of the "Qu" pinyin word uppercase first, followed by figures for grades minimum yield point (σs) value, followed by the symbol is in accordance with the steel impurity elements (sulfur, phosphorus) content by With the change to low and high carbon, manganese and divided into A, B, C, D four and so on.

Such structures biggest steel production, very versatile, multi-rolled sheet, profiles (round, square, flat, workers, slots, angle, etc.) and profiles as well as the manufacture of welded steel pipe. Mainly used for factories, bridges, ships and other structures, and general transmission fluid pipes. Such steel is generally used directly without heat treatment.

Low-alloy high-strength structural steel (GB / T8162-2008)

Such structural steel, in addition to a certain amount of silicon or manganese basic elements, but also contain other elements of the country's resources for the situation. Such as vanadium (V), niobium (Nb), titanium (Ti), aluminum (Al), molybdenum (Mo), nitrogen (N), and rare earth (RE) and other trace elements. According to the chemical composition and performance requirements, the grade by Q295A, B, Q345A, B, C, D, E, Q390A, B, C, D, E, Q420A, B, C, D, E, Q460C, D, E, etc. Grade said its meaning with carbon structure steel pipe.

V, Nb, Ti, Al, etc. grain refinement of trace elements, in addition to these structural steel in A, B grade steel, and its C, D, E grade steel should contain at least one of them; in order to improve the steel performance, A, B grade steel can also join one of them. In addition, Cr steels such, Ni, Cu residual element content of not more than 0.30% each. Q345A, B, C, D, E are representative of such steel grades, where A, B grade steel is usually called 16Mn; C above the level of structural steel required to join one or more trace elements, which increase the mechanical properties of a low-temperature impact properties.

Such structural steel with carbon steel ratio. High strength, good overall performance, long life, wide range of applications, more economical advantages. The multi-rolled steel sheet, profiles, seamless steel tubes, etc., are widely used in bridges, ships, boilers, vehicles and important architectural structures.

3Process

Hot-rolled (extruded seamless pipe): round tube → heating → perforation → three-roll rolling, rolling or extrusion → → set off pipe diameter (or reducing) → cooling → → straightening → hydrostatic pipe billet test (or testing) → mark → storage.

Cold drawn (rolled) seamless steel pipe: round tube → heating → perforation → Heading → annealing → pickling → oiled (copper) → multi-pass cold drawn (cold) → billet tube heat treatment → → straightening → hydrostatic testing (testing) → mark → storage.

8Uses

For the manufacture of pipes, containers, equipment, fittings and mechanical structure seamless steel pipe url is www.netgms.com

Construction: hall structure, sea bridge, airport construction, shipyards, security door, garage door, to strengthen the lining of steel doors and windows, interior partition walls, cable bridge construction and highway safety guards, railings, renovation, residential, decorative piping

Auto Parts: Car and bus manufacturing, transport

Agriculture: Agricultural Equipment

Industry: Machinery, solar stent, offshore oil, mining equipment, electrical and mechanical hardware, engineering, mining, heavy and resources, process engineering, material handling, machine parts

Traffic: pedestrian railing, fence, square structure, guidance sign, road equipment, fences

Logistics and warehousing: supermarket shelves, furniture, school equipment

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