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Steel Pipe
Steel is an alloy consisting mostly iron. Depending on the grade it contains
between 0.2% and 2.1% of carbon that is the most cost-effective alloying
material.
Apart of carbon, there are various other alloying elements used (manganese,
chromium, vanadium, and tungsten). Carbon and other elements act as a
hardening agent. Varying the amount of alloying elements in the steel
controls the hardness, ductility, and tensile strength of the
resulting steel. Steel with higher content of carbon is less ductile but
can be made harder and stronger than iron. These alloys are known as
cast iron for their lower melting point and castability.
Two distinguishing factors for steel with small amount of carbon are steel's
increased rust-resistance and better weldability.
Steel is one of the most common materials and is a major component in
buildings, infrastructure, tools, ships, automobiles, machines, and
appliances.
standards:
China Classification Society and welding materials - China Classification Society (CCS)
Det Norske Veritas (DNV) specification - Det Norske Veritas (DNV)
Lloyd's Register of Shipping (LR) specification - UK Lloyd's Register (LR)
Lloyd's Register in Germany (GL) specification - Germany, Lloyds Register of Shipping (GL)
American Bureau of Shipping (ABS) specification - American Bureau of Shipping (ABS)
Bureau Veritas (BV) norm - Bureau Veritas (BV)
Italian classification society (RINA) norms - the Italian classification society (RINA)
Classification Society of Japan (NK) norms - the Japanese classification society (NK)
GB/T5312-- China's national standards
use:
for the boilers and superheaters and I,II-level pressure piping used in manufacturing seamless steel tubes.
produce steel grades:
320,360,410,460,490, etc.
Tolerance:
steel types
diameter (D)
standards:
GB/T8163-- China's national standards
use:
for the transmission fluid seamless steel tubes used in general
The main production steel grades:
10,20, Q345, etc.
Tolerance:
steel types
diameter (D)
pipe wall thickness (S)
tube cold-drawing
pipe outside diameter (mm)
allow deviation (mm)
pipe wall thickness (mm)
allow deviation (mm)
> 30 ~ 50
± 0.3
≤ 30
± 10%
> 50 ~ 219
± 0.8%
mechanical properties:
standards
Grade
tensile strength (MPa)
yield strength (MPa)
elongation (%)
GB/T8163
10
335 ~ 475
≥ 205
≥
standards:
GB3087 - China National Institute of Standards
GB5310 - China National Institute of Standards
ASME SA210 - American Boiler and Pressure Vessel Code
ASME SA213 - American Boiler and Pressure Vessel Code
DIN17175 - the industry standard the Federal Republic of Germany
use:
for low and medium pressure boiler (generally not more than the working pressure 5.88Mpa, operating temperature at 450 ℃ or less) of heating surface tubes; for high-pressure boiler (pressure 9.8Mpa or more generally, the working temperature of 450 ℃ ~ between 650 ℃) of heating surface tubes, economizer, superheater, reheater, petrochemical and other industrial control.
produce steel grades:
10,20,20 G, 20MnG, 25MnG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG, 12Cr2MoWVTiB, 10Cr9Mo1VNb, SA210A1, SA210C, SA213 T11, SA213 T12, SA213 T22, SA213 T23, SA213 T91, SA213 T92, ST45.8 / Ⅲ , 15Mo3, 13CrMo44, 10CrMo910, etc.
Tolerance:
steel types
standards:
API SPEC 5CT - the standard American Petroleum Institute
use:
for oil well casing and tubing with the seamless steel pipe
produce steel grades:
J55, K55, N80, L80, P110, etc.
Tolerance:
steel types
diameter (D)
wall thickness (S)
pipe cold drawing
pipe outside diameter (mm)
allow deviation (mm)
allow deviation (mm)
<114.3
± 0.79
-12.5%
≥ 114.3
-0.5%, +1%
mechanical properties:
standards
Grade
tensile strength (MPa)
yield strength (MPa)
elongation (%)
hardness
API SPEC 5CT
J55
≥ 517
379 ~ 552
table
standards:
API SPEC 5L - American Petroleum Institute standards
GB/T9711.2-- China's national standards
use:
for the oil and gas industry of oxygen, water, oil pipeline
The main production steel grades:
B, X42, X52, X60, X65, X70
Tolerance:
steel types
pipe outside diameter (D)
pipe wall thickness (S)
tube
pipe outside diameter (mm)
allow deviation (mm)
pipe outside diameter (mm)
allow deviation (mm)
≥ 60.3 and S <20
± 0.75%
≤ 73.0
+15%, -12.5%
≥ 60.3 and S ≥ 20
± 1.00%
> 73.0 and S <20
+15%, -12.5%
> 73.0 and S ≥ 20
+17.5%
standards:
GB9948 - China National Institute of Standards
use:
for the oil refinery furnace tubes, heat exchanger tubes and pipes used seamless steel pipe.
produce steel grades:
10,20,15 CrMo, 1Cr2Mo, 1Cr5Mo, etc.
Tolerance:
steel types
diameter (D)
pipe wall thickness (S)
tube cold-drawing
pipe outside diameter (mm)
allow deviation (mm)
pipe wall thickness (mm)
allow deviation (mm)
> 30 ~ 50
± 0.3
≤ 30
± 10%
> 50 ~ 219
± 0.8%
mechanical properties:
standards:
National Institute of Standards GB/T8162-- China
ASTM A53 - American Society for Testing and Materials standards
ASME SA53 - American Boiler and Pressure Vessel Code
use:
used in the manufacture of pipes, containers, equipment, pipe fittings and mechanical structure seamless steel tube
produce steel grades:
10,20,35,45, Q345, 15CrMo, 12Cr1MoV, A53A, A53B, SA53A, SA53B, etc.
Tolerance:
steel types
diameter (D)
pipe wall thickness (S)
tube cold-drawing
pipe outside diameter (mm)
allow deviation (mm)
pipe wall thickness (mm)
allow deviation (mm)
> 30 ~ 50
± 0.3
≤ 30
± 10%
> 50 ~ 219
± 0.8%
mechanical properties:
standards
Grade