ASTM A213 T22 Material Seamless Heat Exchanger Boiler Tubes

 

​​ASTM A213/ASME SA213 is the standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes.​​

 

​​A213 T22 alloy steel boiler tube is a chromium-molybdenum high-temperature ferritic steel used for boilers and superheaters. Here, "A" represents the ASTM steel designation, "213" is the code serial number, "T22" is the steel grade classification, and "t" denotes small-diameter tubes (equivalent to China's 12Cr2MoG small-diameter tubes). At the same temperature (≤580°C), its creep rupture strength and allowable stress are even higher than those of 9Cr-1Mo steel. Additionally, it offers excellent machinability, weldability, and long-term plasticity. As a result, it is widely used in harsh working environments such as heating pipelines and high-pressure vessels in thermal power, nuclear power, and certain hydrogen production equipment.​

 

Chemical Composition of ASTM A213 T22 Seamless Boiler Tubes

Grade	Chemical Composition(%)
	C	Mn	P	S	Si	Cr	Mo
A213 T22	0.05-0.15	0.30-0.60	≤0.025	≤0.025	≤0.50	1.90-2.60	0.87-1.13

Mechanical Properties of ASTM A213 T22 Seamless Boiler Tubes

Grade	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation(%)	Hardness(HB)
A213 T22	≥415	≥205	30	≤163

Mechanical property requirements do not apply to tubing smaller than 1 ⁄ 8in. [3.2 mm] in inside diameter or thinner than 0.015 in. [0.4 mm] in thickness.

 

Heat Treatment of ASTM A213 T22

TABLE 1 Heat Treatment and Grain Size Requirements

Grade	UNS Number	Heat Treat Type	Austenitizing/ Solutioning Temperature, min or range ºF [ºC]	Cooling Media	Subcritical Annealing or Tempering Temperature, min or range ºF [ºC]	ASTM Grain S
Ferritic Alloy Steels
T22	K21590	full or isothermal anneal	…	…	…	…
		normalize and temper		…	1250 [675]	…

Note:1.Heat treatment shall be carried out separately and in addition to heating for hot forming.
2.ASTM Grain Size No. listed, or coarser, unless otherwise indicated.

 

Application:

Allowable operating temperature: it is mainly used for superheater with wall temperature ≤ 580 ° C and steam pipe and header with wall temperature ≤ 540 ° C of large capacity power station boiler such as 300. 600MW. This kind of steel has been widely used in the United States, Japan and Europe. It has a long history in power plant operation and is a mature steel with stable running and good process performance.

Tests
(1)Tension test--One tension test shall be made on a specimen from one tube for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes.
(2)Hardness Requirements-- Brinell, Vickers, or Rockwell hardness tests shall be made on specimens from two tubes from each lot.
(3)Flattening Test--One flattening test shall be made on specimens from each end of one finished tube.
(4)Flaring Test--One flaring test shall be made on specimens from each end of one finished tube.

ASTM A213 T22 Seamless Ferritic Alloy-Steel Boiler Tubes Quick Details
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 0.9 mm--12.7 mm.
Outer diameter (OD): 12.7 mm--127 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required

ASTM A213 T22 Seamless Boiler Tubes Marking
In addition to the marking prescribed in Specification ASTM A1016/A1016M, the marking shall indicate whether the tube is hot-finished or cold-finished.