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ASME SA213 T91 Alloy Steel Seamless Tube

The specified A213 T91 Material is a 9Cr-1Mo ferritic grade alloy steel. Also referred to as UNS K91560, the deliberate addition of elements vanadium and niobium, along with the controlled content of nitrogen in the alloy of SA213 T91 Tube is what gives it outstanding resistance to heat as well as good creep strength. Usually, the SA213 T91 Seamless Alloy Tube produced as per the ASTM specification are either to be hot finished or they could be cold finished, depending on the requirement of the application.

ASME SA213 T91 Alloy Steel Seamless Tube

Heat treatment performed on these SA213 T91 Tubes, per the specification is to be done separately as well as in addition to heating for those tubes being produced by hot forming. However, in the case of ferritic alloy grades such as the T91 Boiler Tube, the alloy needs to be reheated. Moreover, the specification also makes a note of the several tests to be conducted on the ASTM A213 Gr T91 Tube Material such as the flaring test, flattening test, hardness test, and tension test, which must be done to each tube. Also, each of these ASTM A213 T91 Tubes has been subjected to either a nondestructive electric test or a hydrostatic test.

ASME SA213 T91 Pipe Standard Specification

Specifications ASTM A213 / ASME SA213
Dimensions ASME, ASTM and API
Range 1/2” OD up to 5” OD, customs diameters also available
Size 6.35mm o.d to 101.60mm o.d
Schedule SCH 80, SCH 40, SCH XS, SCH XXS, SCH 160, All Schedules, upto 12mm thk
Type Seamless / Fabricated
Form Square, Round, Hydraulic, Rectangular, Etc.
Length Double Random, Single Random, & Cut Length.
Tubing End Beveled End, Plain End, Treaded.

Fact of T91 Tube

ASME SA213 T91 steel is a 9Cr-1Mo ferritic alloy steel with deliberate addition of vanadium and niobium, as well as controlled nitrogen content. A213 T91 has outstanding creep strength and heat-resistance.]

ASTM A213 T91 Tube Wall thickness & Tolerance

Hot rolled ASTM A213/ ASME SA213 T91 Alloy Steel Tube
Outside Diameter, mm
Tolerance, %

OD≤101.6, WT≤2.4

+40/-0
OD≤101.6, 2.4<WT≤3.8
+35/-0
OD≤101.6, 3.8<WT≤4.6
+33/-0
OD≤101.6, WT>4.6
+28/-0
OD>101.6, 2.4<WT≤3.8
+35/-0
OD>101.6, 3.8<WT≤4.6
+33/-0
OD>101.6, WT>4.6
+28/-0
Cold Drawn ASTM A213/ ASME SA213 T91 Alloy Steel Tube
Outside Diameter, mm
Tolerance, %
OD≤38.1
+20/-0
OD>38.1
+22/-0

Composition Standard of T91 Alloy Steel Seamless Tube

Grade
C≤
Mn
P≤
S≤
Si≤
Mo
T91
0.07~0.14
0.30~0.60
0.02
0.02
0.20~0.50
0.85~1.05

Mechanical Analysis of SA213 T91 Boiler Tube

Grade Tensile Strength, MPa Yield Strength, MPa Elongation, % Hardness, HB
T91 585 min 415 min 20 min 250 max

Equivalent material of T91 Boiler Tube

Trade Name 

Grade

UNS #

Heater Tubes

T91

T91

K90901

A213 / SA213

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