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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Last modified: April 26, 2012