ASTM A707 Forged Flanges ASTM A707 L5 L1 L2 L3 L4 L6 L8 Flanges

ASTM A707 Standard Specification for Forged Carbon and Alloy Steel Flanges for Low Temperature Service

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

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:

(a) Grade L1 to Classes 1 and 2,

(b) 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,

(e) Grade L7 to Classes 1 and 2

(f) Grades L5, L6, and L8 are generally available in any class.

ASTM A707 Heat Treatment

All material shall be heat treated by annealing, normalizing, precipitation hardening, quenching-andtempering, normalizing-and-tempering, normalizing-andprecipitation hardening, or quenching-and-precipitation hardening.

ASTM A707 Chemical Composition

A chemical heat analysis in accordance with Specification A961/A961M shall be made and conform to the requirements as to chemical composition prescribed in Table 1. Leaded steels shall not be permitted.

ASTM A707 Mechanical Requirements

The material in the weld neck shall conform to the mechanical property requirements prescribed in Table 2.

For the purpose of determining conformance with Table 2, mechanical testing requirements shall conform to Specification A961/A961M.

For flanges smaller than 24 in. [610 mm] in size, the forged test blanks shall be at least 2 in. [50 mm] wide by 2 in. [50 mm] thick by 12 in. [300 mm] in length. The test specimens shall be taken with their longitudinal axes parallel to the length of the test blank.

For flanges 24 in. [610 mm] and larger in size, the test blank dimensions and orientation of test specimens with respect to the test blank shall be subject to agreement.

ASTM A707 Hardness Requirements

A sufficient number of hardness measurements shall be made to ensure that the hardness values are within the ranges prescribed in Table 2. The number of flanges to be tested shall be as agreed upon between the manufacturer and the purchaser. The purchaser may verify that the requirement has been met by testing at any location on the flange, provided such testing does not render the flange useless.

ASTM A707 Flanges impact Testing Requirement

The different between L1,L2,L3,L4,L5,L6.L7,L8 is  the impacting test temperature

ASTM A707 Product Marking

In addition to the marking requirements of Specification A961/A961M, the following additional marking requirements apply: 1 The impact test temperature shall be legibly stamped on each flange.

If the flanges have been quenched-and-tempered or quenched-and-aged the letters QT or QA, as applicable, shall be stamped on the flanges following the ASTM designation.

Forgings repaired by welding shall be marked with the letter “W” following the ASTM designation

ASTM A707 Flange order information.

ASTM A707 Gr. L5 CL3 BLIND FLANGES 10in CL150,125-250 AARH,ASME B16.5

BRIDA FLANGES WN 8″ ASME B16.5 CLASE-900 RTJ SCH 60 ASTM A-707 L5 CL4