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Seamless steel pipes for low medium pressure - 10#、20#、AS

Table of Contents
  1. Brief introduction
  2. Popular brands
  3. Process
  4. Production process
  5. Implementation of the standards
  6. Theoretical weight formula
  7. Size requirements
  8. Length requirements
  9. Low and medium pressure boiler seamless steel pipe diameter and wall thickness tolerances
  10. Mechanical Performance Table
  11. Delivery Status
  12. Use
  13. Low-pressure boiler seamless steel tubes Download

1Introduction

Low-pressure boiler seamless pipe is used to manufacture a variety of low and medium pressure boiler superheated steam pipes, boiling water pipes, water wall tubes and superheated steam locomotive boiler tubes, opium pipe, small pipe and brick arch tubes. In addition to chemical composition and mechanical properties of outside pressure to do testing, crimping, flaring, flattening and other tests.

Seamless steel pipes for low and medium pressure - 10#、20#、ASME SA-106B、ASME SA-192、DIN/EN(Euro)P265GH、DIN/EN(Euro)P195G

Twopopular brands

Low and medium pressure boiler seamless steel pipe manufacturing steel is mainly used 10,20

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 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 pipe straightening → → → heat water pressure test (testing) → mark → storage.

4production process

(Allocated) seamless steel pipe with high-quality carbon structural steel hot or cold.

5performance standards

Low pressure in the boiler seamless implementation of standards: (GB3087-1999)

6theoretical weight formula

Steel weight calculation formula: [(OD - Wall Thickness) * thickness] * 0.02466 = kg / m (weight per meter)

7sizes

Steel pipe diameter, wall thickness and theoretical quality should comply with GB / T17395-1998 Table 1.

8low-pressure boiler tube length requirements

Hot rolled (extrusion, expansion) steel .......................................... 4 ~ 12m

Cold drawn (rolled) steel ............................................. 4-10.5m

9low-pressure boiler seamless steel pipe outside diameter and wall thickness tolerances

Pipe species Pipe size / mm Tolerance
Ordinary level High level
Hot rolled (extrusion, expansion) tubes Diameter D ≤159 ± 1.O% (minimum ± 0.50mm) ± O.75% (minimum ± 0.40mm)
> 159 ± 1.0% ± O.90%
Wall thickness S ≤20 + 15.O% (minimum + O.45mm)-12.5% ​​-O.35mm ± lO% (minimum ± 0.30mm)
> 20 ± 12.5% ± lO%
D≥351 thermal expansion pipe ± 15%
Cold drawn (rolled) pipe Diameter D lO ~ 30 ± O.40mm Guests O.20mm
> 30 ~ 50 ± O.45mm ± 0.25mm
> 50 + 1.0% ± 0.75%
1.5 to 3.0 + 15% a 10% ± 10%
> 3.0 + 12.5% ​​in a 10% ± 10%

Note: a bending pipe shall not exceed the following provisions:

    Wall thickness ≤15mm ....................1.5mm / m

    Wall thickness> 15mm .....................2.Omm / m

    Thermal expansion pipe outside diameter ≥51mrn ..................3.Omm / m

    Header pipe shall not exceed the total curvature of 12mm.

  1. According to the requirements, the supply and demand sides negotiated and specified in the contract, the roundness of the same cross-section of steel pipe and

    Wall thickness should not exceed the diameter and wall thickness were no tolerance of 80%.

10Mechanical Performance Table

Longitudinal mechanical properties of steel

Brand No. Wall thickness / mm Tensile strength δb / MPa Yield point ós / MPa Elongation δ5 (%)
10 Whole 335 ~ 475 195 Twenty four
20 <15 4lO ~ 550 245 20
≥15 225

Note: a pipe used for steel grades 10 and 20, the chemical composition shall conform to GB / T699's.

2. The pipe should be hot-rolled or heat treatment delivery. Hot-rolled steel delivery status finishing temperature should be not less than Ar3.

Minimum yield strength steel (MPa) at a high temperature

Brand No. Sample status Temperature / ℃
200 250 300 350 400 450
10 Delivery Status 165 145 122 111 109 107
20 188 170 149 137 134 132

11Delivery Status

State of delivery hot rolled, cold-rolled (allocated) to heat treatment delivery.

12Uses

Low-pressure boiler seamless steel Uses: Suitable for the manufacture of various structural low and medium pressure boiler and locomotive boilers.


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