The Importance of ASTM A312/A213 Standards for Stainless steel pipes
Stainless steel pipes are widely used in various industries due to their excellent Corrosion resistance, high strength, and durability. However, not all stainless steel pipes are created equal. To ensure the highest quality and performance, it is crucial to adhere to industry standards. One such standard is ASTM A312/A213, which sets the guidelines for the manufacturing and testing of Seamless and welded stainless steel pipes.
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OD In (mm)
+
–
WT In (mm)
+
–
<1(25.4)
0.10
0.10
≤1.1/2(38.1)
20%
0
1∼1.1/2(25.4∼38.1)
0.15
0.15
>1.1/2(38.1)
22%
0
>1.1/2∼<2(38.1∼50.8)
0.20
0.20
2∼<2.1/2(50.8∼63.5)
0.25
0.25
2.1/2∼<3(63.5∼76.2)
0.30
0.30
3∼4(76.2∼101.6)
0.38
0.38
>4∼7.1/2(101.6∼190.5)
0.38
0.64
>7.1/2∼9(190.5∼228.6)
0.38
1.14
One of the key aspects of the ASTM A312/A213 standards is the manufacturing process. These standards specify the methods and techniques for producing seamless and welded stainless steel pipes. Seamless pipes are made by piercing a solid billet of stainless steel and then rolling it into a hollow tube. This process ensures a uniform and consistent Wall thickness, resulting in a pipe with excellent dimensional accuracy. On the other hand, welded pipes are made by joining two or more pieces of stainless steel using various Welding techniques. This allows for the production of pipes with larger diameters and lengths.
In addition to the manufacturing process, the ASTM A312/A213 standards also outline the requirements for chemical composition, Mechanical properties, and testing
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
c For through-wall hardness tests of Grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.
