ASTM A312 PIPE

APPLICATION

ASTM A312 / ASME SA312 set standars for seamless and welded austenitic stainless light-weight steel pipes which are used at high temperature and / or for corrosive service. These pipes are used in the process, petrochemical, pharmaceutical and food industries. The most common grades are ss304 and ss316, but a variety of different combinations of the three main elements chrome, nickel and moly are available originating a multitude of grade (which can be divided into four main types: austenitic, ferritic, martensitic and duplex).

The dimensions of stainless steel pipes are set by the ASME B36.19 norm.

The specification (source: ASTM):

This guide covers standard specification for seamless, straight-seam welded, and cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. Several grades of steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, columbium, tantalum, nitrogen, vanadium, copper, cerium, boron, aluminum, and others. All pipes shall be furnished in the heat-treated condition in accordance with the required heat treating temperature and cooling/testing requirements. Tensile properties of the material shall conform to the prescribed tensile strength and yield strength. The steel pipe shall undergo mechanical tests such as transverse or longitudinal tension test and flattening test. Grain size determination and weld decay tests shall be performed. Each pipe shall also be subjected to the nondestructive electric test or the hydrostatic test. 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.

1. Scope

1.1 This specification2 covers seamless, straight-seam welded, and heavily cold worked welded austenitic stainless steel pipe intended for high-temperature and general corrosive service. NOTE 1: When the impact test criterion for a low-temperature service would be 15 ft·lbf [20 J] energy absorption or 15 mils [0.38 mm] lateral expansion, some of the austenitic stainless steel grades covered by this specification are accepted by certain pressure vessel or piping codes without the necessity of making the actual test. For example, Grades TP304, TP304L, and TP347 are accepted by the ASME Pressure Vessel Code, Section VIII Division 1, and by the Chemical Plant and Refinery Piping Code, ANSI B31.3, for service at temperatures as low as −425 °F [−250 °C] without qualification by impact tests. Other AISI stainless steel grades are usually accepted for service temperatures as low as −325 °F [−200 °C] without impact testing. Impact testing may, under certain circumstances, be required. For example, materials with chromium or nickel content outside the AISI ranges, and for material with carbon content exceeding 0.10 %, are required to be impact tested under the rules of ASME Section VIII Division 1 when service temperatures are lower than −50 °F [−45 °C].

1.2 Grades TP304H, TP309H, TP309HCb, TP310H, TP310HCb, TP316H, TP321H, TP347H, and TP348H are modifications of Grades TP304, TP309Cb, TP309S, TP310Cb, TP310S, TP316, TP321, TP347, and TP348, and are intended for service at temperatures where creep and stress rupture properties are important.

1.3 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and, when desired, it is permitted to specify in the order one or more of these supplementary requirements.

1.4 Table X1.1 lists the standardized dimensions of welded and seamless stainless steel pipe as shown in ANSI B36.19. These dimensions are also applicable to heavily cold worked pipe. Pipe having other dimensions is permitted to be ordered and furnished provided such pipe complies with all other requirements of this specification.

1.5 Grades TP321 and TP321H have lower strength requirements for pipe manufactured by the seamless process in nominal wall thicknesses greater than 3/8 in. [9.5 mm].

1.6 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. NOTE 2: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”

SIZE RANGE ASME B36.19

(Dimensions of stainless steel pipes: outside diameter and wall thickess chart in mm) 

Note: schedule 5S is hard to find on the market, therefore sch 10S is recommended for pipe specifications and piping classes.

NPS OD SCH 5S SCH 10S SCH 40S SCH 80S
1/4 13.72 - 1.65 2.24 3.02
3/8 17.15 - 1.65 2.31 3.2
1/2 21.34 1.65 2.11 2.77 3.73
3/4 26.67 1.65 2.11 2.87 3.91
1 33.4 1.65 2.77 3.38 4.55
1.25 42.16 1.65 2.77 3.56 4.85
1.5 48.26 1.65 2.77 3.68 5.08
2 60.33 1.65 2.77 3.91 5.54
2.5 73.03 2.11 3.05 5.16 7.01
3 88.9 2.11 3.05 5.49 7.62
3.5 101.6 2.11 3.05 5.74 8.08
4 114.3 2.11 3.05 6.02 8.56
5 141.3 2.77 3.4 6.55 9.53
6 168.28 2.77 3.4 7.11 10.97
8 219.08 2.77 3.76 8.18 12.7
10 273.05 3.4 4.19 9.27 12.7
12 323.85 3.96 4.57 9.53 12.7
14 355.6 3.96 4.78 9.53 12.7
16 406.4 4.19 4.78 9.53 12.7
18 457.2 4.19 4.78 9.53 12.7
20 508 4.78 5.54 9.53 12.7
22 558.8 4.78 5.54 - -
24 609.6 5.54 6.35 9.53 12.7
26 660.4 - - - -
28 711.2 - - - -
30 762 6.35 7.92 - -

CHEMICAL COMPOSITION

The table shows the chemical composition of the most used A312 stainless steel pipes: 

A312 GRADES

UNS C Mn P S Si Cr Ni Mo Ti Nb N
TP304 S3040 0.08 2.0 0.045 0.030 1.0 18.0-20.0 8.0-11.0        
TP304L S30403 0.035 2.0 0.045 0.030 1.0 18.0-20.0 8.0-13.0        
TP304H S30409 0.04-0.10 2.0 0.045 0.030 1.0 18.0-20.0 8.0-11.0        
TP304N S30451 0.08 2.0 0.045 0.030 1.0 18.0-20.0 8.0-18.0       0.10-0.16
TP304LN S30453 0.035 2.0 0.045 0.030 1.0 18.0-20.0 8.0-12.0       0.10-0.16
TP309S S30908 0.08 2.0 0.045 0.030 1.0 22.0-24.0 12.0-15.0 0.75      
TP309H S30909 0.04-0.10 2.0 0.045 0.030 1.0 22.0-24.0 12.0-15.0        
TP309Cb S30940 0.08 2.0 0.045 0.030 1.0 22.0-24.0 12.0-16.0 0.75   10xC min
1.10 max
 
TP309HCb S30941 0.04-0.10 2.0 0.045 0.030 1.0 22.0-24.0 12.0-16.0 0.75   10xC min
1.10 max
 
TP310S S3108 0.08 2.0 0.045 0.030 1.0 24.0-26.0 19.0-22.0 0.75      
TP310H S3109 0.04-0.10 2.0 0.045 0.030 1.0 24.0-26.0 19.0-22.0        
TP310Cb S31040 0.08 2.0 0.045 0.030 1.0 24.0-26.0 19.0-22.0 0.75   10xC min
1.10 max
 
TP310HCb S31041 0.04-0.10 2.0 0.045 0.030 1.0 24.0-26.0 19.0-22.0 0.75   10xC min
1.10 max
 
TP316 S3160 0.08 2.0 0.045 0.030 1.0 16.0-18.0 11.0-14.0 2.0-3.0      
TP316L S31603 0.035 2.0 0.045 0.030 1.0 16.0-18.0 10.0-14.0 2.0-3.0      
TP316H S31609 0.04-0.10 2.0 0.045 0.030 1.0 16.0-18.0 11.0-14.0 2.0-3.0      
TP316Ti S31635 0.08 2.0 0.045 0.030 0.75 16.0-18.0 10.0-14.0 2.0-3.0 5x
(C-N)
-0.70
  0.10
TP316N S31651 0.08 2.0 0.045 0.030 1.0 16.0-18.0 10.0-14.0 2.0-3.0     0.10-0.16
TP316LN S31653 0.035 2.0 0.045 0.030 1.0 16.0-18.0 11.0-14.0 2.0-3.0     0.10-0.16
TP317 S3170 0.08 2.0 0.045 0.030 1.0 18.0-20.0 10.0-14.0 3.0-4.0      
TP317L S31703 0.035 2.0 0.045 0.030 1.0 18.0-20.0 11.0-15.0 3.0-4.0      
TP321 S3210 0.08 2.0 0.045 0.030 1.0 17.0-19.0 9.0-12.0       0.10
TP321H S32109 0.04-0.10 2.0 0.045 0.030 1.0 17.0-19.0 9.0-12.0       0.10
TP347 S3470 0.08 2.0 0.045 0.030 1.0 17.0-19.0 9.0-13.0        
TP347H S34709 0.04-0.10 2.0 0.045 0.030 1.0 17.0-19.0 9.0-13.0        
TP347LN S34751 0.05-0.02 2.0 0.045 0.030 1.0 17.0-19.0 9.0-13.0     0.20-
50.0
0.06-0.10
TP348 S3480 0.08 2.0 0.045 0.030 1.0 17.0-19.0 9.0-13.0        
TP348H S34809 0.04-0.10 2.0 0.045 0.030 1.0 17.0-19.0 9.0-13.0        

 

YIELD / TENSILE STRENGHT

Grade Tensile Strength, N/mm2 (min) Yield Strength, N/mm2 (min) Elongation, % (min)
TP304 515 205 35
TP304L 485 170 35
TP316 515 205 35
TP316L 485 170 35
TP321 OD < 17,1 mm - 515; OD < 17,1 mm - 205; 35
OD > 17,1 mm - 485 OD > 17,1 mm - 170

 

ASTM A312 Mechanical Properties

Material

Heat
Treatment

Temperure
Min.
º F(º C)

Tensile Strength
Ksi (MPa), Min.

Yield Strength
Ksi (MPa), Min.

Elongation %, Min

TP304

Solution

1900 (1040)

75(515)

30(205)

35

TP304L

Solution

1900 (1040)

70(485)

25(170)

35

TP304H

Solution

1900 (1040)

75(515)

30(205)

35

TP310S

Solution

1900 (1040)

75(515)

30(205)

35

TP316

Solution

1900(1040)

75(515)

30(205)

35

TP316L

Solution

1900(1040)

70(485)

25(170)

35

TP316H

Solution

1900(1040)

75(515)

30(205)

35

TP316Ti

Solution

1900(1040)

75(515)

30(205)

35

TP321

Solution

1900(1040)

75(515)

30(205)

35

TP321H

Solution

Cold: 2000(1100)
Hot: 1925(1050)

75(515)

30(205)

35

TP347

Solution

1900(1040)

75(515)

30(205)

35

TP347H

Solution

Cold: 2000(1100)
Hot: 1925(1050)

75(515)

30(205)

 

TOLERANCE

DIAMETER

NPS

ASTM A312 OD Tolerance

+

inch

mm

inch

mm

1/8~1 1 /2
> 1 1 /2~4
> 4~8
> 8~18
> 18~26
> 26~34
> 34~48

1/64(0.015)
1/32(0.031)
1/16(0.062)
3/32(0.093)
1/8(0.125)
5/32(0.156)
3/16(0.187)

0.4
0.8
1.6
2.4
3.2
4.0
4.8

1/32(0.031)
1/32(0.031)
1/32(0.031)
1/32(0.031)
1/32(0.031)
1/32(0.031)
1/32(0.031)

0.8
0.8
0.8
0.8
0.8
0.8
0.8

WALL THICKNESS

NPS

ASTM A312 WT Tolerance, %

+

1/8-2 1 /2

20.0

12.5

3~18, t/D≤ 5%

22.5

12.5

3~18, t/D> 5%

15.0

12.5

≥ 20, welded

17.5

12.5

≥ 20, seamless, t/D≤ 5%

22.5

12.5

≥ 20, seamless, t/D> 5%

15.0

12.5

 

 

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