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ASTM A179/A179M-90a

2019-04-26


ASTM A179 (ASTM A179 Carbon Steel Boiler Tube) is American standard. Cold drawn seamless low carbon heat exchanger and condenser tube.

ASTM A179 Carbon Steel Boiler Tube

 

1

Range of application

1.This standard is applicable to the thinnest seamless steel tubes used in tubular heat exchangers, condensers and similar heat transfer devices.

2. This standard is applicable to steel tubes of 3.2~76.2.

2

General requirements

ASTM A450/A450M shall also be complied with unless otherwise specified in this international standard.

3

Surface quality

Scale free, other surface quality as per ASTM A450/A450M.

4

Grade and chemical composition(%)

C : 0.06~0.18 , Mn : 0.27~0.63 , P : ≦0.035 , S : ≦0.035

Note: It is not permitted to provide an alloy label that specifically requires the addition of elements other than those described above.

5

Heat treatment

ASTM A179 carbon steel boiler tube after a final cold drawing, heat treatment under the temperature not below 650 ℃.

6

Hardness testing

HRB≦72. Two steel tubes from each batch are required for rockwell hardness test. (The so-called batch refers to all uncut steel tubes of the same nominal diameter and wall thickness produced with the same furnace steel. If it is a batch furnace, the batch only refers to the steel pipe of the same furnace number, the same size and the same heat treatment after loading. In the case of continuous furnaces, the "batch" shall include all steel tubes of the same furnace number, of the same size, and treated in the same heat treatment furnace at the same temperature, at the same heating time and at the same furnace speed.)

7

Flattening test

The method is according to ASTM450/A450M. Sample for each batch of steel pipe, or take two steel pipes in the remaining parts, and cut sample to test. (A batch of tubes is 250 pieces)

8

Flaring performance

The method is according to ASTM450/A450M. Sample for each batch of steel pipe, or take two steel pipes in the remaining parts, and cut sample to test. (A batch of tubes is 250 pieces)

9

Edge performance

The steel pipe of S/D less than 10%( S is the actual average wall thickness), If the flaring instead of flaring, the method is according to ASTM A450. Sample for each batch of steel pipe, or take two steel pipes in the remaining parts, and cut sample to test. Steel tubes that do not fall within the above requirements do not need to be rolled edge test. (A batch of tubes is 250 pieces)

10

Hydrostatic test

Do the hydraulic pressure test one by one. If the buyer agrees, non-destructive testing can be used instead of hydraulic pressure test. Non-destructive inspection is according to ASTM A450/A450M.

11

Product marking

Except as required of ASTM A450/A450M, also include the buyer's name and order number.

 

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