Common Tubing Specifications
|ASME Spec.||ASME Grade||ERW or Smls.||Description||Typical uses|
|SA-178||A||ERW||Low carbon steel - C=0.18 max.||Boiler tubes, economizers, low temp. superheaters|
|SA-178||C||ERW||Medium carbon steel - C=0.35 max.||Boiler tubes, economizers, low temp. superheaters|
|SA-178||D||ERW||Carbon-manganese steel - C=0.27 max||Not in common use|
|SA-192||Smls.||Low carbon steel - C=0.18 max||Waterwalls, economizers, low temp. superheaters|
|SA-210||A1||Smls.||Medium carbon steel - C=0.27 max.||Waterwalls, economizers, superheaters|
|SA-210||C||Smls.||Medium carbon steel - C=0.35 max.||Waterwalls, economizers, superheaters|
|SA-209||T1||Smls.||Low alloy steel - low carbon, 1/2% moly||Superheaters|
|SA-209||T1a||Smls.||Low alloy steel - medium carbon, 1/2% moly||Superheaters|
|SA-209||T1b||Smls.||Low alloy steel - low carbon, 1/2% moly||Superheaters|
|SA-213||T2||Smls.||Intermediate alloy - 1/2% chrome, 1/2% moly||Waterwalls, superheaters, not in common use|
|SA-213||T11||Smls.||Intermediate alloy - 1 1/4% chrome, 1/2% moly||Waterwalls, superheaters|
|SA-213||T22||Smls.||Intermediate alloy - 2 1/4% chrome, 1% moly||Waterwalls, superheaters|
|SA-213||T5||Smls.||Intermediate alloy - 5% chrome, 1/2% moly||High temperature superheaters, not in common use|
|SA-213||T9||Smls.||Intermediate alloy - 9% chrome, 1% moly||High temperature superheaters, no longer in common use|
|SA-213||T91||Smls.||Intermediate alloy - 9% chrome, 1% moly, 1/4% vanadium||High temperature superheaters - the latest and greatest|
|SA-213||Tp-304||Smls.||Stainless steel - 18% chrome, 8% nickel||Superheaters|
|SA-213||Tp-304H||Smls.||Stainless steel for high temperature service||High temperature superheaters|
|SA-213||Tp-316||Smls.||Stainless steel - 16% chrome, 11% nickel||Superheaters|
|SA-213||Tp-316H||Smls.||Stainless steel for high temperature service||High temperature superheaters|
|SA-213||Tp-321||Smls.||Stainless steel - 17% chrome, 9% nickel, 0.60% titanium||Superheaters|
|SA-213||Tp-321H||Smls.||Stainless steel for high temperature service||High temperature superheaters|
|SA-213||Tp-347||Smls.||Stainless steel - 17% chrome, 9% nickel, columbium + tantalum=1.00% max.||Superheaters|
|SA-213||Tp-347H||Smls.||Stainless steel for high temperature service||High temperature superheaters|
For boiler tubes, SA-178A is the most common, and most economical choice.
Economizers are usually made from SA-178A or SA-210-A1.
Superheater materials vary widely, with SA-178A and SA-192 used most commonly in the lower temperature ranges. SA-210-A1,
SA-213-T11, and SA-213-T22 are commonly seen in the intermediate temperature ranges, with the stainless grades, most
frequently Tp-304H and Tp-347H, reserved for the higher temperature superheaters, although SA-213-T91 is increasingly specified
for the highest temperatures.
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