ASTM A213 T91 Seamless alloy tube

Description

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger. It is also an 9Cr-1Mo-V alloy steel with UNS designation K90901. Compared to its equivalent ASTM A335 P91, the chemical composition requirement of T91 steel is slightly different.

Grade T91 is a new ferritic alloy heat resistant steel developed based on grade T9 steel through the process of pure purification, fine crystallization metallurgy, microalloying and controlled rolling. The steel has good comprehensive mechanical properties, good welding properties and good process properties, suitable for high-temperature compression parts of the material.

WIHO metals is a leading seamless steel tube supplier and manufacturer, we supply ASTM A213 Grade T91 and ASME SA T91 alloy steel pipe and their equivalent material for boiler systems in various sizes and specifications.

We are one of the leading Manufacturers, Supplier and Exporters of high quality ASTM A213 T91 Alloy Steel Seamless Tube. These tubes are widely used in various application industry such as Oil & Gas, Power, Fertilizers, Heat-Exchangers, Paper & Pulp, pharmaceuticals, Chemicals, Water Treatment, Dairy etc.

ASTM A213 T91 and ASTM A335 P91

Grade T91 specified in ASTM A213 which do Ferrite and Austenitic boiler superheater and heat exchanger seamless steel tube while grade P91 specified in ASTM A335 do Ferritic and alloy seamless steel tube intended for high-temperature service. Grade T91 and P91 steel pipes have a similar chemical composition and mechanical properties. As for their difference, we can say that they have been substituted for another one when the same purpose.

ASTM A213 T91 Tubing Equivalent Material

ASTM	DIN	JIS	GB
P91	X10CrMoVNNb91	STBA 26	10Cr9Mo1VNbN

ASTM A213 T91 Chemical Composition

Grade	C	Mn	P,≤	S,≤	Si	Cr	Mo
T91	0.05–0.15	0.30–0.60	0.025	0.025	0.50–1.00	2.65–3.35	0.80–1.06

ASTM A213 T91 Mechanical Properties

Material	Yield strengthReH/Rp0,2 N/mm² min	Tensile strengthRm N/mm²	Elongation A% min
T91	220Mpa	415Mpa	30

ASTM A209 Through A213

Other standard specifications include the categories of A209 seamless carbon-molybdenum alloy-steel boiler and superheater tubes;
A210 seamless medium-carbon steel boiler and superheater tubes and A213 seamless ferritic and austenitic steel boiler, superheater and heat-exchanger tubes.
Piping wall thicknesses range from 1/2 inch to 5 inches.
A213 grades also have the letter H or M assigned, which changes the composition and specifications for that series.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

ASTM A213M-09 Material comparison tables (ASTM →KS, JIS, DIN, BS, NBN, NF, UNI)

Grade	UNS Designation	C	Mn	P	S	Si	Nickel	Chromium	Molybdenum	Vana-	Boron	Niobium	Nitrogen	Aluminum	Tungsten
T2	K11547	0.10–0.20	0.30–0.61	0.025	0.025B	0.10–0.30	...	0.50–0.81	0.44–0.65	...	...	...	...	...	...
T5	K41545	0.15	0.30–0.60	0.025	0.025	0.5	...	4.00–6.00	0.45–0.65	...	...	...	...	...	...
T5b	K51545	0.15	0.30–0.60	0.025	0.025	1.00–2.00	...	4.00–6.00	0.45–0.65	...	...	...	...	...	...
T5c	K41245	0.12	0.30–0.60	0.025	0.025	0.5	...	4.00–6.00	0.45–0.65	...	...	...	...	...	...
T9	K90941	0.15	0.30–0.60	0.025	0.025	0.25–1.00	...	8.00–10.00	0.90–1.10	...	...	...	...	...	...
T11	K11597	0.05–0.15	0.30–0.60	0.025	0.025	0.50–1.00	...	1.00–1.50	0.44–0.65	...	...	...	...	...	...
T12	K11562	0.05–0.15	0.30–0.61	0.025	0.025B	0.5	...	0.80–1.25	0.44–0.65	...	...	...	...	...	...
T17	K12047	0.15–0.25	0.30–0.61	0.025	0.025	0.15–0.35	...	0.80–1.25	...	0.15	...	...	...	...	...
T21	K31545	0.05–0.15	0.30–0.60	0.025	0.025	0.50–1.00	...	2.65–3.35	0.80–1.06	...	...	...	...	...	...
T22	K21590	0.05–0.15	0.30–0.60	0.025	0.025	0.5	...	1.90–2.60	0.87–1.13	...	...	...	...	...	...
T23	K40712	0.04–0.10	0.10–0.60	0.03	0.01	0.5	0.4	1.90–2.60	0.05–0.30	0.20–0.30	0.0010–0.006	0.02–0.08	0.015	0.03	1.45–1.75
T24	K30736	0.05–0.10	0.30–0.70	0.02	0.01	0.15–0.45	...	2.20–2.60	0.90–1.10	0.20–0.30	0.0015–0.007	...	0.012	0.02	...
T36	K21001	0.10–0.17	0.80–1.20	0.03	0.025	0.25–0.50	1.00–1.30	0.3	0.25–0.50	0.02	...	0.015–0.045	0.02	0.05	...
T91	K90901	0.07–0.14	0.30–0.60	0.02	0.01	0.20–0.50	0.4	8.0–9.5	0.85–1.05	0.18–0.25	...	0.06–0.10	0.030–0.07	0.02	...
T92	K92460	0.07–0.13	0.30–0.60	0.02	0.01	0.5	0.4	8.5–9.5	0.30–0.60	0.15–0.25	0.001–0.006	0.04–0.09	0.030–0.07	0.02	1.5–2.00
T122	K91271	0.07–0.14	0.7	0.02	0.01	0.5	0.5	10.0–11.5	0.25–0.60	0.15–0.30	0.0005–0.005	0.04–0.10	0.040–	0.02	1.50–2.50
T911	K91061	0.09–0.13	0.30–0.60	0.02	0.01	0.10–0.50	0.4	8.5–9.5	0.90–1.10	0.18–0.25	0.0003–0.006	0.06–0.10	0.040–0.09	0.02	0.90–1.10

Note:

A Maximum, unless range or minimum is indicated. Where ellipses (...) appear in this table, there is no requirement, and analysis for the element need not be determined or reported.

B It is permissible to order T2 and T12 with a sulfur content of 0.045 max. See 16.3.

C Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering.
Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.

ASTM A213 Mechanical properties

Grade	Tensile strength (Mpa)	Yield point(Mpa) not less than	Elongation(%) not less than	Impact(J) not less than	Hardness not less than
A213 T2/SA213 T2	≥415	205		"	85HRB
A213 T11/SA213 T11	≥415	205		"	85HRB
A213 T22/SA213 T22	≥415	205		"	85HRB
A213 T23/SA213 T23	≥510	400	20	"	97HRB
A213 T24/SA213 T24	≥585	415	20	"	25HRB
A213 T91/SA213 T91	≥585	415	20	"	25HRB
A213 T911/SA213 T911	≥620	440	20	"	25HRB
A213 T22/SA213 T92	≥620	440	20	"	25HRB
A213 T122/SA213 T122	≥620	400	20		25HRB
TP304H	≥515	205	35		90HRB
TP316H	≥515	205	35		90HRB
TP321H	≥515	205	35		90HRB
TP347H	≥515	205	35		90HRB
S30432	≥590	235	35		95HRB
TP310HCbN	≥655	295	30		100HRB

ASTM A213 tube Size range

NPS, inch	Outside Diameter(mm)	Wall Thickness(mm)	Max. Length(M)
1/8	10,3	1,24; 1,73; 2,40	12
1/4	13,7	1,65; 2,24; 3,02
3/8	17,1	1,65; 2,31; 3,20
1/2	21,3	1,65; 2,11; 2,77; 3,73
3/4	26,7	1,65; 2,11; 2,87; 3,91
1	33,4	1,65; 2,77; 3,38; 4,55	10
1.25	42,4	1,65; 2,77; 3,56; 4,85
1.5	48,3	2,77; 3,68; 5,08
2	60,3	3,91; 5,54	7
2.5	73,0	5,16; 7,01

ASTM A213 Standard Scope

1.1 This specification covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes, designated Grades T91, TP304, etc. These steels are listed in Tables 1 and 2.
1.2 Grades containing the letter, H, in their designation, have requirements different from those of similar grades not containing the letter, H. These different requirements provide higher creep-rupture strength than normally achievable in similar grades without these different requirements.
1.3 The tubing sizes and thicknesses usually furnished to this specification are 1/8 in. [3.2 mm] in inside diameter to 5 in. [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm], inclusive, in minimum wall thickness or, if specified in the order, average wall thickness. Tubing having other diameters may be furnished, provided such tubes comply with all other requirements of this specification.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. The inch-pound units shall apply unless the “M” designation of this specification is specified in the order.

TABLE 1 Chemical Composition Limits, %A, for Low Alloy SteelA Maximum, unless range or minimum is indicated. Where ellipses (…) appear in this table, there is no requirement, and analysis for the element need not be determined or reported.

B It is permissible to order T2 and T12 with a sulfur content of 0.045 max. See 16.3.

C Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering. Hardness testing shall be performed at mid-thickness of the product. Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.

Referenced Documents (purchase separately)

Other ASTM Standards

A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
E112 Test Methods for Determining Average Grain Size

ASME SA 213 Grade T5 Alloy Steel Seamless Tubes are minimum-wall-thickness, seamless ferritic and austenitic steel, boiler and superheater tubes and austenitic steel heat-exchanger tubes, designated Grades T5, T11,T22,T91 etc. The tubing sizes and thicknesses usually furnished to ASME SA 213 Grade T5 specification are 1-8 in. [3.2 mm] in inside diameter to 5 in. [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm], inclusive, in minimum wall thickness. SA 213 Tubes having other dimensions may be furnished & provided such tubes comply with all other requirements of this specification.

Wall Thickness : the minimum wall thickness at any point or end on ASME SA 213 pipes and tubes shall not be greater than 12.5% under the nominal thickness specified.

Inner Diameter: For pipe ordered in inside diameter, the inside diameter shall not vary more than ñ 1% from the required/specified inside diameter.