BLACK PIPE

PACKAGE:

Chemical composition-Q235:

Q235 made by grade A\B\(GB700-88)

Q235A  C0.14~0.22% Mn0.30~0.65 Si≤0.30 S≤0.050 P≤0.045

Q235B  C0.12~0.20% Mn0.30~0.670 Si≤0.30 S≤0.045 P≤0.045

Mechanical behavior-Q235:

tensile strength: σb/MPa 375-500

tensil stretch(δ5/%): Min 22% 

+Black ERW STEEL PIPE:

9.7.2 Scaffold tubing and fittings specifications

A. Scaffold tubing should be 48.3mm(1.9inch)nominal outside diameter.

B. Scaffold tubing(for tube-and-coupler,system,and fabricated tubular frame scaffolds,etc.)

shall be welded or seamless structural steel pipe fabricated in accordance with any of the following pipe fabrication specifications and as specified and this section:

Applicant :

--ASTM A500,Grade B; 290N/mm2(42ksi)(30kg/mm2)minimum yield stress;3.4mm or 3.76mm nominal wall thickness

--GB-- X-42

--ASTM A53,Grade B;240N/mm2(35ksi)(24kg/mm2)minimum yield stress;3.68mm nominal wall thickness.

--GB--Q235B

--BS1139,Part1,Section 1.1;235N/mm2(34ksi)(24kg/mm2)minimum yield stress;4.0mm nominal wall thickness(EN39,THICKNESS TYPE4,IS equivalent).

 --GB--Q235

--EN10219;320N/mm2(46ksi)(32kg/mm2)minimum yield stress;3.2 mm nominal wall thickness (EN39,THICKNESS TYPE 3,

IS NOT EQUIVALENT).

--GB--Q345

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