2007 SECTION IV

TABLE HF-300.1 MAXIMUM ALLOWABLE STRESS VALUES FOR FERROUS MATERIALS, ksi (MPa) (CONT'D)

(Multiply by 1,000 to Obtain psi) -

Spec. Min. Spec. Min. External Tensile Yield Max. Allow.

Spec. Nominal Group Pressure Strength, Strength, Stress Value, No. Grade Composition P-No. No. Chart ksi (MPa) ksi (MPa) Note(s) ksi (M Pa)

Pipe and Tubes (Cont'd) Electric Resistance Welded Carbon Steel

Butt Welded

Forgings Carbon Steels

SA-105 . . . SA-181 Class 60 SA-181 Class 70 SA-266 1 SA-266 2 SA-266 3

Castings Carbon Steels

SA-216 WCA SA-216 WCB

Bolting Carbon Steels

1018, Class A

Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel

Carbon steel

Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel Carbon steel

Carbon steel Carbon steel

Carbon steel ~ c ~ - ~ / , M o 1Cr-0.2Mo

1035, Class A . . .

1045, Class A

1045, Class B 1050, Class A

Carbon steel

Carbon steel . . . Carbon steel

Carbon steel Carbon steel . . . 1Cr-0.2Mo 1 3 / , ~ i - - ' / ~ ~ r - - l / q ~ o Carbon steel Carbon steel Carbon steel

2007 SECTION IV

TABLE HF-300.1 MAXIMUM ALLOWABLE STRESS VALUES FOR FERROUS MATERIALS, ksi (MPa) (CONT'D)

(Multiply by 1,000 to Obtain psi)

NOTES:

(1) These allowable stress values apply also to structural shapes. (2) SAICSA-G40.21 as specified in Section I IA, grade 38W or 44W, may be used in lieu of SA-36 for plates and bars not exceeding 3/4 in.

(20 mm). For use at the same maximum allowable stress values as SA-36. ( 3 ) For thicknesses up to ?/, in. (9.52 mm), inclusive.

(4) For thicknesses over ?/, in. to 0.580 in. (9.5 mm to 14.7 mm), inclusive. (5) For thicknesses over 0.580 to 0.750 in. (14.7 m m to 19.0 mm), inclusive. (6) Tensile value is expected minimum.

(7) The stress value includes a joint factor of 0.85. (8) The stress value includes a joint factor of 0.60.

(9) The stress value includes a casting quality factor of 0.80. Increased casting quality factors as a result of material examination beyond the requirements of the material specifications shall not be permitted.

(10) The stress value is established from a consideration of strength only and wil l be satisfactory for average service. For bolted joints, where freedom from leakage over a long period of time without retightening is required, lower stress values may be necessary as determined from the relative flexibility of the flange and bolts, and corresponding relaxation properties.

(11) For tie-rods and draw bolts on cast-iron sectional boilers subject to system pressure. Welding is not permitted. (a) To 7/, in. (22 mm) diam. incl. (b) Over 7/, in. to 1% in. incl. (22 mm to 32 mm). (c) TO 3 in. (76 mm) incl.

(12) The water temperature shall not exceed 210°F (98'C). (13) The maximum thickness of material covered by this Table is ?/, in. (9.5 mm). (14) The service temperature shall not exceed 200°F (93'C).

(15) Filler metal shall be Type 430 with a nominal titanium content of approximately 1.25%. The 300 series of chromium-nickel-iron filler metals shall not be used in welding vessels conforming to the requirements of Section IV .

(16) Filler metal shall be Type 430 with a nominal molybdenum content of approximately 2%. The 300 series of chromium-nickel-iron filler metals shall not be used in welding vessels conforming to the requirements of Section IV.

(17) Tubing material shall be fully annealed. (18) Limitations of HF-204.2 also apply. (19) Heat treatment after forming or fabrication is neither required nor prohibited. (20) For arc or resistance welded studs only. (21) These allowable stresses apply only to material 5 in. (127 mm) and under in thickness. (22) The minimum thickness for header material is 0.10 in. (2.6 mm).