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ASTM A541

ASTM A541 Specification

Forgings, Fasteners, Boltings, Stud Bolts, Screws, Nuts

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Scope

ASTM A541/ A541M Specification covers carbon steel & alloy steel forgings duly quenched and tempered for pressure vessel components. A541 Standard specification delegates thirteen different grades & five different classes of forgings used boilers, pressure vessels, and associated equipment applications.: The most commonly used forgings manufactured in accordance with ASTM A541 include tube sheets, hubbed flat heads, or nozzles, that are ordered for ASME Boiler and Pressure Vessel Code applications.

Chemical Requirements

GradeCMPSSiNiCrMoVTiBCuNbCa
ASTM A541 Grade 10.35 max0.40-0.900.025 max0.025 max0.15-0.350.40 max0.25 max0.10 max0.05 max. . .. . .. . .. . .. . .
ASTM A541 Grade 1A0.30 max0.70-1.350.025 max0.025 max0.15-0.400.40 max0.25 max0.10 max0.05 max. . .. . .. . .. . .. . .
ASTM A541 Grade 20.27 max0.50-0.900.025 max0.025 max0.15-0.350.50-1.000.25-0.450.55-0.700.05 max. . .. . .. . .. . .. . .
ASTM A541 Grade 30.25 max1.20-1.500.025 max0.025 max0.15-0.350.40-1.000.25 max0.45-0.600.05 max. . .. . .. . .. . .. . .
ASTM A541 Grade 1C0.18 max1.30 max0.025 max0.025 max0.15-0.350.25 max0.15 max0.05 max0.02-0.12. . .. . .. . .. . .. . .
ASTM A541 Grade 11 Class 40.10-0.200.30-0.800.025 max0.025 max0.50-1.000.50 max1.00-1.500.45-0.650.05 max. . .. . .. . .. . .. . .
ASTM A541 Grade 22 Classes 4 and 50.05-0.150.30-0.600.025 max0.025 max0.50 max0.50 max2.00-2.500.90-1.100.05 max. . .. . .. . .. . .. . .
ASTM A541 Grade 4N0.23 max0.20-0.400.025 max0.025 max0.30 max2.8-3.91.25-2.000.40-0.600.03 max. . .. . .. . .. . .. . .
ASTM A541 Grade 50.23 max0.20-0.400.025 max0.025 max0.30 max2.8-3.91.25-2.000.40-0.600.08 max. . .. . .. . .. . .. . .
ASTM A541 Grade 3V0.10-0.150.30-0.600.020 max0.020 max0.10 max. . .2.8-3.30.90-1.100.20-0.300.015-0.0350.001-0.003. . .. . .. . .
ASTM A541 Grade 22 Class 30.11-0.150.30-0.600.015 max0.015 max0.50 max0.25 max2.00-2.500.90-1.100.02 max. . .. . .. . .. . .. . .
ASTM A541 Grade 22V0.11-0.150.30-0.600.015 max0.010 max0.10 max0.25 max2.00-2.500.90-1.100.25-0.350.030 max0.0020 max0.20 max0.07 max0.015 max2
ASTM A541 Grade 3VCb0.10-0.150.30-0.600.020 max0.010 max0.10 max0.25 max2.7-3.30.90-1.100.20-0.300.015 max. . .0.25 max0.015-0.0700.0005-0.0150

Mechanical Requirements

Gradein. [mm], max
1 and 1A3 [75]
2 Class 2 and 3 Class 26 [150]
2 Class 1 and 3 Class 18 [205]
1C4 [100]
11 Class 45 [125]
22 Class 4, 4N Class 2, 5 Class 26 [150]
22 Class 58 [205]
4N Class 1, 5 Class 1, 4N Class 3, 3V, 3VCb, 22V,
and 22 Class 3		10 [255]

ASTM A541 Tensile Requirements

GradeTensile strength, ksi [MPa]Yield strength (0.2% offset), min, ksi [MPa]Elongation in 2 in. or 50 mm, min, %Reduction of area, min, %
Grades 1 and 1A70 to 95 [485–660]36 [250]2038
Grades 2 Class 1, 3 Class 1, 1C and 11 Class 480 to 105 [550–720]50 [340]1838
Grade 2 Class 2 and Grade 3 Class 290 to 115 [620–790]65 [450]1635
Grade 22 Class 4105–130 [720–900]85 [590]1645
Grade 22 Class 5115–140 [790–1000]100 [690]1540
Grade 4N Class 1 and Grade 5 Class 1105 to 130 [720–900]85 [590]1848
Grades 4N Class 2 and 5 Class 2115–140 [790–1000]100 [690]1645
Grade 4N Class 390 to 115 [620–790]70 [480]2048
Grades 3V and 22V85–110 [585–760]60 [415]1845
Grade 22 Class 385–110 [585–760]55 [380]1845
Grade 3VCb85–110 [585–760]60 [415]1845

ASTM A541 V-Notch Impact Requirements

GradeMinimum average value of set of three specimens, ft·lbf (J)3Minimum value of one specimen, ft·lbf (J)
Grades 1, 1A, and 11 Class 415 [20]10 [14]
Grade 2 Class 2 and 3 Class 235 [47]430 [41]4
Grade 2 Class 1, 3 Class 1 and 1C30 [41]25 [34]
Grade 22 Class 525 [34]20 [27]
Grades 22 CL 4 4N Classes 1, 2, 3, 2005 Classes 1,235 [47]30 [41]
Grades 3V and 3VCb, Grade 22, Class 3 and Grade 22V40 [55]535 [50]5

Heat Treatment

After complete austenization, the forgings shall be quenched in a suitable liquid medium by spraying or immersion. For Grade 22V forgings, the minimum austenitizing temperature shall be 1650°F [900°C]. Quenching shall be followed by tempering at a subcritical temperature and holding at this temperature for a minimum time of 1⁄2 h/in. [25 mm] of maximum section thickness. Minimum tempering temperatures shall be:

Grade°F [°C]
1, 1A, 2 Class 2, 3 Class 21150 [620]
2, 3, Class 2, 22 Class 31200 [650]
1C, 11 Class 4, 22 Class 4, 4N Class 1, 4N Class 2, 5 Class 1, 5 Class 21100 [595]
22 Class 151050 [565]
4N Class 31125 [610]
3V1250 [675]
22V1250 [675]

For Classes 1, 1A, 2, 2A, 3, or 3A a multiple stage austenitizing procedure may be used whereby the forging is first fully austenitized and liquid quenched, followed by reheating within the intercritical tempera- ture range to partially reaustenitize, and again liquid quenched. On completion of the austenitizing/quenching cycles, the forgings shall be tempered at a subcritical temperature

Marking

The purchaser may specify additional identifica- tion marking and the location of the marking. If stamps are used, they shall be round-nosed or “interrupteddot” die stamps having a minimum radius of 1⁄32 [.8 mm].

Certifications

  • EN 10204 3.1
  • EN 10204 3.2
  • PED 2014/68/EC
  • MERKBLATT AD 2000 W2/W7/W10
  • API 20 E BSL 1/ BSL 2
  • NACE MR 0175
  • NACE MR 0103

Supplementary Requirements

S1Simulated Post-Weld Heat Treatment of Mechanical Test Samples
S2Ultrasonic Inspection
S3Magnetic Particle Examination
S4Charpy V-Notch Impact Transition Curve
S5Additional Charpy Data
S6Charpy Impact Tests
S7Drop-Weight Test
S8Restrictive Chemistry for Grades 4N and 5
S9Additional Vanadium
S10Special Steels
S12Restrictive Chemistry
S13Alternative Fracture Toughness Requirements
S14Alternative Test Specimen Orientation
S15Restricted Sulfur Content