GB 3087 standard seamless boiler alloy steel pipe Low pressure Medium pressure



It is mainly used to make high-quality carbon structural steel, low pressure medium pressure boiler pipe, super heated steam seamless carbon steel pipe

Main Grade

Grade of high-quality carbon structural steel: 10#,20#


Chemical Component

Standard Grade Chemical Composition(%)
    C Si Mn P S Cr Cu Ni
GB3087 10 0.07~0.13 0.17~0.37 0.38~0.65 ≤0.030 ≤0.030 0.3~0.65 ≤0.25 ≤0.30
  20 0.17~0.23 0.17~0.37 0.38~0.65 ≤0.030 ≤0.030 0.3~0.65 ≤0.25 ≤0.30

Mechanical Property

Standard Steel pipe Wall thickness Tensile strength Yield Strength Elongation
GB3087   (mm) (MPa) (MPa) %
10 / 335~475 195 24
20 <15 410~550 245 20
≥15 225


Permissible deviation of outer diameter of steel tubes

Type of steel tube  Permissible deviation
Hot rolled (extruded, expanded) steel tube       ± 1.0% D or ± 0.50, take the greater number      
Cold drawn (rolled) steel tube ± 1.0% D or ± 0.30, take the greater number      

Permissible deviation of the wall thickness of hot rolled (extrusion, expansion) steel tubes

Unit: mm

Type of steel tube Outer diameter of steel tube     S / D  Permissible deviation
hot rolled (extruded) steel tube ≤ 102  – ± 12.5 % S or ± 0.40, take the greater number      
> 102 ≤ 0.05 ± 15% S or ± 0.40, take the greater number      
> 0.05 ~ 0.10  ± 12.5% S or ± 0.40, take the greater number      
> 0.10 + 12.5% S
- 10% S
hot expand steel tube + 15% S

Permissible deviation of the wall thickness of cold drawn (rolled) steel tubes

Unit: mm

Type of steel tube Wall thickness Permissible deviation
Cold drawn (rolled) steel tube ≤ 3 15 - 10 % S or ± 0.15, take the greater number      
> 3 + 12.5% S
- 10% S

Test Requirement

Flattening test

Steel tubes with an outer diameter greater than 22 mm and up to 400 mm, and wall thickness greater than 10 mm should undergo the flattening test. After the samples are flattened

Bending test

Steel tubes with an outer diameter not greater than 22 mm should undergo the bending test. The bending angle is 90o . The bending radius is 6 times the outer diameter of the steel tube.After bending the sample, no fissures or cracks are permitted to appear on the sample.

Macroscopic examination

For steel tubes directly made by continuously cast billets or steel ingots, the supplying party should guarantee that there are no white spots, impurities, sub-surface air bubbles, skull patches or layering on the cross-sectional acid pickled macroscopic tissue of the billet or steel tube.

Non-destructive inspection

According to the demanding party’s request, which is then negotiated between the supplying and demanding parties and indicated in the agreement, ultrasonic flaw detection may be individually performed for steel tubes. The longitudinal manual defect of the reference sample tube should meet the requirements for post-inspection acceptance grade C8 specified in GB/T 5777-1996.


Product Detail

High Pressure Boiler Tube


ASME SA-106/SA-106M-2015


ASME SA-213/SA-213M

ASTM A335/A335M-2018