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ASTM A213 T91 Alloy Seamless Steel Pipe

Standard: ASTM A213/ASME SA213
Product origin: China
Availability: Stock
Material/Grade: T91

A-213 t91 is ASTM A-213 / A-213m standard steel grade: in 1970s, based on 9Cr-1Mo steel, a new type of ferritic shape steel was formed by adding a small amount of Nb and V microalloying elements and controlling the content of n elements in 9

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ASTM A213 T91 Alloy Seamless Steel Pipe

ASTM A213 T91 Seamless Ferritic Alloy-Steel Boiler Tubes
Standard:ASTM A213/ASME SA213
Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes

ASTM A213 T91 Seamless Ferritic Alloy-Steel Boiler Tubes 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.

A-213 T91: "A" is the mark of ASTM steel material. "213" refers to the specification reference number, "T91" refers to the steel grade classification, "T" refers to small diameter pipe, equivalent to China's 10Cr9Mo1VNbN small diameter pipe.)

A-213 t91 is ASTM A-213 / A-213m standard steel grade: in 1970s, based on 9Cr-1Mo steel, a new type of ferritic shape steel was formed by adding a small amount of Nb and V microalloying elements and controlling the content of n elements in 9Cr-1Mo steel by several laboratories and burnxiao engineering company in the United States. The steel has good comprehensive mechanical properties, stable structure and properties before and after aging, good welding and technological properties, high endurance strength and oxidation resistance. In 1995, the steel was transplanted into GB5310 standard in China, and the grade was 10Cr9Mo1VNb.

ASTM A213 T91 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

Additional Info
Port of Shipment: Tianjin, China
Payment Terms:T / T, LC
Delivery: 7-15 days after payment
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

Specification of ASTM A213 T91 Boiler Tubes

OD (mm)

Wall Thickness(mm)

2.5

3.5

4.5

6.5-7

7.5-8

8.5-9

9.5-10

Φ25-Φ28

●

Φ32

●

Φ34-Φ36

●

Φ38

●

Φ40

●

Φ42

●

Φ45

●

Φ48-Φ60

●

Φ63.5

●

Φ68-Φ73

●

Φ76

●

Φ80

●

Φ83

●

Φ89

●

Φ95

●

Φ102

●

Φ108

●

Φ114

●

Φ121

●

Φ127

●

Materials and Manufacture
ASTM A213 T91 Seamless Ferritic Alloy-Steel Boiler Tubes are made by the seamless process and shall be either hot finished or cold finished, as specified.

Grain Size
Grain size shall be as given in Table 1,
Grain size determinations, shall be made on one end of one finished tube from each lot.

Heat Treatment of ASTM A213 T91

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
T91	K90901	normalize and temper	1900–1975 [1040–1080]	…	1350–1470 [730–800]	…

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.

Chemical Composition of ASTM A213 T91 Seamless Boiler Tubes

Chemical Composition(%)
C	Mn	P	S	Si	Cr	Mo	V	N	Ni	Al	Nb
0.07-0.14	0.3-0.6	≤0.02	≤0.01	0.2-0.5	8.0-9.5	0.85-1.05	0.18-0.25	0.03-0.07	≤0.4	≤0.04	0.06-0.10

Mechanical Properties of ASTM A213 T91 Seamless Boiler Tubes

Low Alloy Steels
Grade	UNS Designation	Tensile Strength, min, ksi [MPa]	Yield Strength, min, ksi [MPa]	Elongation in 2 in. or 50 mm, min, %	Hardness
					Brinell/Vickers	Rockwell
T91	K90901	85 [585]	60 [415]	20	190 to 250 HBW/ 196 to 265 HV	90 HRB to 25

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.

The dimensional tolerances of ASTM A213 Seamless Boiler Tubes
Tolerances of Wall Thickness

Wall Thickness, %
Outside Diameter in. [mm]	0.095 [2.4] and Under		Over 0.095 to 0.150 [2.4 to 3.8], incl		Over 0.150 to 0.0180 [3.8 to 4.6], incl		Over 0.180 [4.6]
	Over	Under	Over	Under	Over	Under	Over	Under
Seamless, Hot-Finished Tubes
4 [100] and under	40	0	35	0	33	0	28	0
Over 4 [100]	....	....	35	0	33	0	28	0
Seamless, Cold-Finished Tubes
			Over	Under
1 1 ⁄ 2 [38.1] and under			20	0
Over 1 1 ⁄ 2 [38.1]			22	0

Tolerances of Outside Diameter

Pecified Outside Diameter,in. [mm]	Permitted Variations, in. [mm]
Pecified Outside Diameter,in. [mm]	Over	Under
Hot-Finished Seamless Tubes
4 [100] or under	1 ⁄ 64 [0.4]	1 ⁄ 32 [0.8]
Over 4 to 7 1 ⁄ 2 [100 to 200], incl	1 ⁄ 64 [0.4]	3 ⁄ 64 [1.2]
Over 7 1 ⁄ 2 to 9 [200 to 225], incl	1 ⁄ 64 [0.4]	1 ⁄ 16 [1.6]
Cold-Finished Seamless Tubes
Under 1 [25]	0.004 [0.1]	0.004 [0.11]
1 to 1 1 ⁄ 2 [25 to 40], incl	0.006 [0.15]	0.006 [0.15]
Over 1 1 ⁄ 2 to 2 [40 to 50], excl	0.008 [0.2]	0.008 [0.2]
2 to 2 1 ⁄ 2 [50 to 65], excl	0.010 [0.25]	0.010 [0.25]
2 1 ⁄ 2 to 3 [65 to 75], excl	0.012 [0.3]	0.012 [0.3]
3 to 4 [75 to 100], incl	0.015 [0.38]	0.015 [0.38]
Over 4 to 7 1 ⁄ 2 [100 to 200], incl	0.015 [0.38]	0.025 [0.64]
Over 7 1 ⁄ 2 to 9 [200 to 225], incl	0.015 [0.38]	0.045 [1.14]

Tolerances of Length

Method of Manufacture	Specified Outside Diameter, in.[mm]	Cut Length, in. [mm]
Method of Manufacture	Specified Outside Diameter, in.[mm]	Over	Under
Seamless, hot-finished	All sizes	3 ⁄ 16 [5]	0 [0]
Seamless, cold-finished	Under 2 [50.8]	1 ⁄ 8 [3]	0 [0]
	2 [50.8] or over	3 ⁄ 16 [5]	0 [0]
	2 [50.8] or over	3 ⁄ 16 [5]	0 [0]

Hydrostatic or Nondestructive Electric Test
Each tube will be subjected to the nondestructive electric test or the hydrostatic test.

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.

Surface Condition
Ferritic alloy cold-finished steel tubes are free of scale and suitable for inspection.
Ferritic alloy hot-finished steel tubes are free of loose scale and suitable for inspection.

Note: Material furnished under ASTM A213 conform to the applicable requirements of the current edition of Specification A1016/A1016M

Application of ASTM a-213 T91 alloy steel pipe:

Allowable service temperature: ASTM A213 T91 alloy steel pipe is mainly used for manufacturing high temperature superheater, reheater and other pressure parts of subcritical and supercritical power plant boilers with metal wall temperature not exceeding 625 ° C, and also for pressure vessels and nuclear power high temperature pressure parts.

Application of T / P91 boiler pipe in petrochemical industry:

T / P91 can be used to replace T / P22 and T / P5 tubes in distillation, cracking units and refineries because of its good high temperature mechanical properties and high temperature hydrogen resistance. Moreover, t / P91 is more suitable for boilers in sulfur rich environment than t / P22 and T / P5. Generally speaking, P91 pipe with pipe diameter greater than 168mm and T91 pipe with pipe diameter less than or equal to 168mm belong to the same steel type, and the requirements for chemical composition and mechanical properties are the same.

ASTM A213 T91 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.

Photos of ASTM A213 T91 Alloy-Steel Boiler Tubes

ASTM_A213_T91_Alloy_Steel_Boiler_Tubes

Selection of A-213 T91 alloy pipe welding material

Manual welding, gas tungsten arc welding or automatic melting electrode welding can be used. The same kind of steel can be welded with cm-9cb manual electrode made in Japan. The gas tungsten arc welding can be welded with tgs-9cb and mgs-9cb welding wire made in Japan. Ernicr-3 welding material can be used for welding with ADI stainless steel. The steel has no tendency of hot cracking, but has a tendency of cold cracking. Preheating is not required before welding of small diameter thin-wall pipe, and preheating at 200 ℃ before welding of thick wall pipe can prevent cold cracking. After welding, stress relief heat treatment shall be conducted at 750 ° C for not less than 1 hour.

Knowledge of A-213 T91 alloy steel pipe

A-213 T91 is a kind of material between 12Cr1MoV and stainless steel. Its structure is improved 9Cr-1Mo high strength martensitic heat-resistant steel, which has high fracture strength and resistance to thermal corrosion. A-213 T91 is an ideal tube for boiler heating surface tube bank in the temperature range of 600-650 ℃. It has good oxidation resistance, higher thermal conductivity than austenitic steel. Its linear expansion coefficient is close to that of pearlitic steel, and its price is lower than that of austenitic steel. When the service temperature is lower than 620 ℃, the allowable stress of the steel is higher than that of the austenitic stainless steel, especially for the dissimilar steel welded joint with the austenitic stainless steel, its thermal strength performance can reach its own level of the same kind of steel pipe welded joint. Compared with A-213 TP304H, the thermal fatigue resistance of welded joint is very good. The practice shows that A-213 T91 can partly replace A-213 TP304h in the manufacture of boiler superheater and reheater heating surface serpentine tube bank, and has obvious economic benefits.

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