High Alloy Steel (Acier fortement allié)

Quelques exemples des contraintes admissibles "S" d’aciers inoxydables typiques du Code ASME Section II-Part D, Table 1A, metric

NB: Veuillez utiliser Section II Part D pour tous les matériaux ASME autorisés.

high alloy steel

Spec. No.

SA-182

SA-312

SA-240

Type/Grade

F321

F316L

TP316L

316Ti

304

Nominal Composition

18Cr-10Ni-Ti

16Cr-12Ni-2Mo

16Cr-12Ni-2Mo-Ti

18Cr-8Ni

Product Form

Forgings

wld. pipe

smls. & wld. pipe

plate

Alloy Desig./UNS No.

S32100

S31603

S31635

S30400

Size/Thickness [mm]

≤ 125

P-No.

Group No.

Min. Tensile Strength [MPa]

515

485

515

Min. Yield Strength [MPa]

205

170

205

I-Applic. and Max. Temp. Limit [°C]

816

454

816

III-Applic. and Max. Temp. Limit [°C]

427

VIII-1-Applic. and Max. Temp. Limit [°C]

816

454

816

XII-Applic. and Max. Temp. Limit [°C]

343

External Pressure Chart No.

HA-2

HA-4

HA-2

HA-1

Notes

G12, T7

G21

G5, G21, G24

G5, G21, W12,W14

G5,G12,T8

G5,G12,H1,T7

-30 to 40°C [MPa]

138

115

97.9

115

138

≤ 65°C [MPa]

130

106

97.9

115

138

≤ 100°C [MPa]

123

96.3

97.9

115

138

137

≤ 125°C [MPa]

118

91.3

97.9

115

138

134

≤ 150°C [MPa]

114

87.4

97.9

115

138

130

≤ 200°C [MPa]

106

81.2

93.0

109

134

126

≤ 250°C [MPa]

99.7

76.0

87.2

103

125

122

≤ 300°C [MPa]

94.5

72.5

82.9

98.0

117

116

≤ 325°C [MPa]

92.3

71.2

81.6

95.7

116

114

≤ 350°C [MPa]

90.7

70.0

80.2

94.1

114

111

≤ 375°C [MPa]

89.4

68.8

78.4

92.8

112

109

≤ 400°C [MPa]

87.5

67.5

77.2

90.9

111

107

≤ 425°C [MPa]

68.9

66.3

75.9

89.0

110

105

≤ 450°C [MPa]

85.7

65.0

74.7

87.8

109

103

≤ 475°C [MPa]

85.0

63.8

73.4

86.6

108

101

≤ 500°C [MPa]

83.9

107

99.3

≤ 525°C [MPa]

83.0

106

98.0

≤ 550°C [MPa]

77.6

105

93.3

≤ 575°C [MPa]

59.2

99.8

79.6

≤ 600°C [MPa]

44.8

80.3

65.4

≤ 625°C [MPa]

32.9

65.5

51.4

≤ 650°C [MPa]

24.5

50.4

41.7

≤ 675°C [MPa]

18.3

38.6

32.9

≤ 700°C [MPa]

12.6

29.6

26.5

≤ 725°C [MPa]

8.41

23.0

21.3

≤ 750°C [MPa]

6.18

17.7

17.2

≤ 775°C [MPa]

4.37

13.4

13.9

≤ 800°C [MPa]

2.77

10.4

11.1

≤ 825°C [MPa]

1.62

8.05

8.73

Notes

(b)

for interpolation consider General Notes (b):
The stress values in this Table may be interpolated to determine values for intermediate temperatures. The values at intermediate temperatures shall be rounded to the same number of decimal places as the value at the higher temperatur between which values are being interpolated.The rounding rule is: when the next digit beyond the last place to be retained is less than 5, retain unchanged the digit in the last place retained; when the digit next beyond the last place to be retained is 5 or greater, increase by 1 the digit in the last place retained.

Due to the relatively low yield strength of these materials, these higher stress values were established at temperatures where the short – time tensile properties govern to permit the use of these alloys where slightly greater deformation is acceptable. The stress values in this range exceed 66 2/3 % but do not exceed 90% of the yield strength at temperature. Use of these stresses may result in dimensional changes due to permanent strain. These stress values are not recommended for the flanges of gasketed joints or other applications where slight amounts of distortion can cause leakage or malfunction. For Section III applications, Table Y – 2 lists multiplying factors that, when applied to the yield strength values shown in Table Y – 1, will give allowable stress values that will result in lower levels of permanent strain.

G10

Upon prolonged exposure to temperatures above 425°C, the carbide phase of carbon steel may be converted to graphite. See Nonmandatory Appendix A, A – 201 and A – 202.

G12

At temperatures above 550°C, these stress values apply only when the carbon is 0.04% or higher on heat analysis.

G21

For Section I, use is limited to PEB – 5.3. See PG – 5.5 for cautionary note.

G24

A factor of 0.85 has been applied in arriving at the maximum allowable stress values in tension for this material. Divide tabulated values by 0.85 for maximum allowable longitudinal tensile stress.

For temperatures above 550°C, these stress values may be used only if the material is heat treated by heating to the minimum temperature specified in the material specification, but not lower than 1040°C, and quenching in water or rapidly cooling by other means.

For Section I applications, stress values at temperatures of 450°C and above are permissible but, except for tubular products 75 mm O.D. or less enclosed within the boiler setting, use of these materials at these temperatures is not current practice.

Allowable stresses for temperatures of 370°C and above are values obtained from time – dependent properties.

Allowable stresses for temperatures of 400°C and above are values obtained from time – dependent properties.

Allowable stresses for temperatures of 565°C and above are values obtained from time – dependent properties.

Allowable stresses for temperatures of 595°C and above are values obtained from time – dependent properties.

Allowable stresses for temperatures of 620°C and above are values obtained from time – dependent properties.

W12

These S values do not include a longitudinal weld efficiency factor. For Section III applications, for materials welded without filler metal, ultrasonic examination, radiographic examination, or eddy current examination, in accordance with NC – 2550, shall provide a longitudinal weld efficiency factor of 1.00. Materials welded with filler metal meeting the requirements of NC – 2560 shall receive a longitudinal weld efficiency factor of 1.00. Other longitudinal weld efficiency factors shall be in accordance with the following:
(a) for single butt weld, with filler metal, 0.80
(b) for single or double butt weld, without filler metal, 0.85
(c) for double butt weld, with filler metal, 0.90
(d) for single or double butt weld, with radiography, 1.00

W14

These S values do not include a weld factor. For Section VIII, Division 1, and Section XII applications using welds made without filler metal, the tabulated tensile stress values shall be multiplied by 0.85. For welds made with filler metal, consult UW – 12 for Section VIII, Division 1, or TW – 130.4 for Section XII, as applicable.

General Information

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