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ASTM A707

ASTM A707 Specification

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

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Scope

This specification covers forged carbon and alloy steel flanges intended primarily for petroleum and gas pipelines in areas subject to low ambient temperatures. Included are flanges to specified dimensions or to dimensional standards such as those MSS, ASME, and API specifications that are referenced in Section 2.
Supplementary requirements are provided for use when additional requirements are desired. These shall apply only when specified individually by the purchaser in the order.
Eight grades, four yield-strength classes, and three different notch toughness levels are included.
The availability of a particular size of flange of a specific grade and class is limited only by the capability of the composition to meet the specified mechanical property requirements. However, current practice normally limits the following:

  • Grade L1 to Classes 1 and 2,
  • Grade L2 to Classes 1, 2, and 3, (c) Grade L3 to Classes 1, 2, and 3, (d) Grade L4 to Classes 1, 2, and 3,
  • Grade L7 to Classes 1 and 2, and
  • Grades L5, L6, and L8 are generally available in any class.

Chemical Requirements

GradeElements
C, max, %Mn,%P, max, %S, max,%Si, max, %Cr,%Ni,%Mo,%V,%N, %Cu, %Nb, %
Heat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysisHeat analysisProduct analysis
ASTM A707 L1 A0.200.230.60-1.500.55-1.600.0300.0350.0300.0400.350.370.30 max0.34 max0.40 max0.43 max0.12 max0.13 max0.05 max0.06 max……0.40 max0.43 max0.02 max0.03 max
ASTM A707 L2 A0.300.330.60-1.350.55-1.450.0300.0350.0300.0400.350.370.30 max0.34 max0.40 max0.43 max0.12 max0.13 max0.05 max0.06 max……0.40 max0.43 max0.02 max0.03 max
ASTM A707 L30.220.251.15-1.501.05-1.600.0250.0300.0250.0350.300.320.30 max0.34 max0.40 max0.43 max0.12 max0.13 max0.04-0.110.03–0.130.010-0.0300.005-0.0350.20 mine0.18 mine0.02 max0.03 max
ASTM A707 L40.180.200.45-0.650.40-0.700.0250.0300.0250.0350.350.370.30 max0.34 max1.65-2.001.60-2.050.20-0.300.19-D.330.05 max0.06 max……0.40 max0.43 max0.02 max0.03 max
ASTM A707 L50.070.090.40-0.700.35-0.750.0250.0300.0250.0350.350.370.60-0.900.56-0.940.70-1.000.67-1.030.15-0.250.14-0.280.05 max0.06 max……1.00-1.300.95-1.350.03 min0.02 min
ASTM A707 L60.070.091.85-2.201.75-2.300.0250.0300.0250.0350.150.170.30 max0.34 max0.40 max0.43 max0.25–0.350.22–0.380.05 max0.06 max……0.40 max0.43 max0.06-0.100.05-0.11
ASTM A707 L7 B0.200.220.90 max1.00 max0.0250.0300.0250.0350.350.370.30 max0.34 max3.2-3.73.18-3.820.12 max0.13 max0.05 max0.06 max……0.40 max0.43 max0.02 max0.03 max
ASTM A707 L80.200.220.20-0.400.15-0.450.0200.0250.0200.0250.350.371.50-2.001.44-2.062.8-3.92.68-3.970.40-0.600.35-0.650.05 max0.06 max……0.40 max0.43 max0.02 max0.03 max
  • A The sum of copper, nickel, chromium, and molybdenum shall not exceed 1.00 % on heat analysis.
    B The sum of chromium, molybdenum and vanadium shall not exceed 0.32 % on heat analysis.
    C When specified

Mechanical Requirements

PropertyClass 1Class 2Class 3Class 4
Yield strengthA min, ksi [MPa]42 [290]52 [360]60 [415]75 [515]
Tensile strength, min, ksi [MPa]60 [415]66 [455]75 [515]90 [620]
Elongation in 2 in. or 50 mm, min, %22222020
Reduction of area, min, %40404040
Hardness, HBW149-207149-217156-235179-265
Cv energy absorption,B,C min, avg, ft·lbf [J]30 [41]40 [54]50 [68]50 [68]
Cv energy absorption,B,D min, ft·lbf [J]24 [33]32 [43]40 [54]40 [54]
  • A 0.2 % offset.
    B For a set of three full-size [10 by 10 mm] Charpy V-notch specimens. Acceptance values for sub-size specimens are reduced in proportion to the reduction in width of the specimen.
    C These requirements are intended to minimize fracture initiation. They are not intended to give assurance against fracture propagation. If minimization of fracture propagation is of interest, consideration should be given to specifying Supplementary Requirement S7 at the operating temperature.
    D Minimum impact energy permitted for one specimen only of a set of three specimens.

Heat Treatment

After forging and before reheating for heat treatment, the forging shall be allowed to cool substantially below the transformation range. The method of cooling shall be such as to ensure against the development of cracks, flakes, etc.
All material shall be heat treated by annealing, normalizing, precipitation hardening, quenching-and-tempering, normalizing-and-tempering, normalizing-and-precipitation hardening, or quenching-and-precipitation hardening.
The procedures for the various heat treatments are as given in Specification A961/A961M except as defined in the following:
Precipitation Hardening-Consists of heating to a temperature between 1000 and 1250°F [538 and 677°C], holding at temperature for not less than 1⁄2 h, and then cooling at any convenient rate.

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

S1Ultrasonic Examination
S2Additional Tension and Impact Tests
S3Carbon Equivalent
S4Notch Toughness, 50 % Shear FATT Minimum
S5Additional Ultrasonic Test Requirement
S6Notch Toughness, Measurement, and Reporting of Percent Shear and Lateral Expansion