ASTM A182

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6.5 Except as provided for in 6.4, the finished product shall

be a forging as defined in the Terminology section of Specifi-

cation A788/A788M.

7. Heat Treatment

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7.1 After hot working, forgings shall be cooled to a tem-

perature below 1000 °F [538 °C] prior to heat treating in

accordance with the requirements of Table 1.

7.2 Low Alloy Steels and Ferritic and Martensitic Stainless

Steels—The low alloy steels and ferritic and martensitic

stainless steels shall be heat treated in accordance with the

requirements of 7.1 and Table 1. When more than one heat

treatment option is listed for a Grade in Table 1, any one of the

heat treatments listed shall be performed. The selection of the

heat treatment shall be at the manufacturer’s option, unless

otherwise stated in the purchase order.

7.2.1 Liquid Quenching—Except as permitted in 7.2.2, for

F1, F 2, and F 3, and when agreed to by the purchaser, liquid

quenching followed by tempering shall be permitted provided

the temperatures in Table 1 for each grade are used.

7.2.1.1 Marking—Parts that are liquid quenched and tem-

pered shall be marked “QT.”

7.2.2 Alternatively, Grade F 1, F 2, and F 12, Classes 1 and

2 may be given a heat treatment of 1200 °F [650 °C] minimum

after final hot or cold forming.

7.3 Austenitic and Ferritic-Austenitic Stainless Steels—

Except as permitted by 7.5, the austenitic and ferritic-austenitic

stainless steels shall be heat treated and liquid-quenched in

accordance with the requirements of 7.1 and Table 1.

7.3.1 Alternatively, immediately following hot working,

while the temperature of the forging is not less than the

minimum solution annealing temperature specified in Table 1,

forgings made from austenitic grades (except grades F 304H, F

309H, F 310, F 310S, F 310H, F 316H, F 316Ti, F 321, F

321H, F 347, F 347H, F 348, F 348H, F 45, F35030, and F 56)

may be individually rapidly quenched in accordance with the

requirements of Table 1. Ferritic-austenitic grades may be

solution annealed without cooling below 1000 °F by being

re-heated to the solution annealing temperature required in

Table 1, held for a time sufficient to dissolve phases and

precipitates which may cause a reduction in corrosion or

mechanical properties, and quenched in accordance with Table

1.

7.3.2 See Supplementary Requirement S8 if a particular

heat treatment method is to be employed.

7.4 Time of Heat Treatment—Heat treatment of forgings

may be performed before machining.

7.5 Forged or Rolled Bar—Forged or rolled austenitic

stainless bar from which cylindrically shaped parts are to be

machined, as permitted by 6.4, and the parts machined from

such bar, without heat treatment after machining, shall be

furnished to the annealing and quenching or rapid-cooling

requirements of Specification A484/A484M or this

specification, with subsequent light cold drawing and straight-

ening permitted (see Supplementary Requirement S3 if anneal-

ing must be the final operation).

7.6 Hollow Bar—Austenitic stainless hollow bar from

which cylindrically shaped parts are to be machined, as

permitted by 6.4, and the parts machined from such hollow bar,

without heat treatment after machining, shall be furnished to

the annealing and quenching or rapid{cooling requirements of

Specification A511/A511M, or this specification, with subse-

quent light cold drawing and straightening permitted (see

Supplementary Requirement S3 if annealing must be the final

operation).

8. Chemical Composition

8.1 A chemical heat analysis in accordance with Specifica-

tion A961/A961M shall be made and conform to the chemical

composition prescribed in Table 2.

8.2 Grades to which lead, selenium, or other elements are

added for the purpose of rendering the material free-machining

shall not be used.

8.3 Starting material produced to a specification that spe-

cifically requires the addition of any element beyond those

listed in Table 2 for the applicable grade of material is not

permitted.

8.4 Steel grades covered in this specification shall not

contain an unspecified element, other than nitrogen in stainless

steels, for the ordered grade to the extent that the steel

conforms to the requirements of another grade for which that

element is a specified element having a required minimum

content. For this requirement, a grade is defined as an alloy

described individually and identified by its own UNS designa-

tion or Grade designation and identification symbol in Table 2.

8.5 Product Analysis—The purchaser may make a product

analysis on products supplied to this specification in accor-

dance with Specification A961/A961M.

9. Mechanical Properties

9.1 The material shall conform to the requirements as to

mechanical properties for the grade ordered as listed in Table 3.

9.2 Mechanical test specimens shall be obtained from pro-

duction forgings, or from separately forged test blanks pre-

pared from the stock used to make the finished product. In

either case, mechanical test specimens shall not be removed

until after all heat treatment is complete. If repair welding is

required, test specimens shall not be removed until after

post-weld heat treatment is complete, except for ferritic grades

when the post-weld heat treatment is conducted at least 50 °F

[30 °C] below the actual tempering temperature. When test

blanks are used, they shall receive approximately the same

working as the finished product. The test blanks shall be heat

treated with the finished product and shall approximate the

maximum cross section of the forgings they represent.

9.3 For normalized and tempered, or quenched and tem-

pered forgings, the central axis of the test specimen shall be

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A solution annealing temperature above 1950 °F [1065 °C] may impair the

resistance to intergranular corrosion after subsequent exposure to sensitizing

conditions in F 321, F 321H, F 347, F 347H, F 348, and F 348H. When specified

by the purchaser, a lower temperature stabilizing treatment or a second solution

annealing shall be used subsequent to the initial high temperature solution anneal

(see Supplementary Requirement S10).

A182/A182M − 24a

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