ASTM A333 low temperature seamless steel pipe,ASTM A333 low temperature smls steel pipe
ASTM A333 low temperature seamless steel pipe,ASTM A333 low temperature smls steel pipe

ASTM A333 low temperature seamless steel pipe

Date:2024-09-19

ASTM A333 specifies seamless and welded carbon and alloy steel pipes designed for low-temperature applications. These pipes are manufactured using either the seamless or welding process, with no filler metal added during welding. To ensure the desired microstructure, all pipes undergo a specific treatment process.


This standard includes several grades of ferritic steel: Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, and Grade 11. Of these, Grade 6 is the most widely used. In this article, we will provide an in-depth look at ASTM A333 low-temperature seamless steel pipes.


Chemical Requirements:

Composition, %

Element

Grade 1

Grade 3

Grade 6

Carbon, max

0.30

0.19

0.30

Manganese

0.40 – 1.06

0.31 – 0.64

0.29 – 1.06

Phosphorous, max

0.025

0.025

0.025

Sulfur, max

0.025

0.025

0.025

Silicon


0.18 – 0.37

0.10 min

Nickel


3.18 – 3.82



Mechanical Properties:


Grade 1

Grade 3

Grade 6

Tensile Strength, min, psi (MPa)

55,000 (380)

65,000 (450)

60,000 (415)

Yield Strength, min, psi (MPa)

30,000 (205)

35,000 (240)

35,000 (240)


CVN Impact (Charpy) Test:

Minimum Impact Test Temperature

Grade 1

-50 (F)

-45 (°C)

Grade 3

-150 (F)

-100 (°C)

Grade 6

-50 (F)

-45 (°C)


Tensile Requirements:

The material shall conform to the requirements as proscribed:



Grade 1

Grade 3

Grade 6



psi

MPa

psi

MPa

psi

MPa

Tensile Strength, min

55,000

380

65,000

450

60,000

415

Yield Strength, min

30,000

205

35,000

240

35,000

240



Longitudinal

Transverse

Longitudinal

Transverse

Longitudinal

Transverse

Basic minimum elongation for walls 5/16 in. [8 mm] and over in thickness, strip tests, and for all small sizes tested in full section

35

35

30

20

30

16.5

When the standard round 2-in. or 50-mm gage length or proportionally smaller size test specimen with the gage length equal to 4D (4 times the diameter) is used

28

20

22

14

22

12

For strip tests, a deduction for each 1/32in. [0.8 mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation of the following percentage

1.75

1.25

1.50

1.00

1.50

1.00


Wall Thickness

Grade 1

Grade 3

Grade 6

in.

mm

Longitudinal

Transverse

Longitudinal

Transverse

Longitudinal

Transverse

5/16 (0.312)

8

35

25

30

20

30

16

9/32 (.281)

7.2

33

24

28

19

28

15

1/4 (.250)

6.4

32

23

27

18

27

15

7/32 (.219)

5.6

30

-

26

-

26

-

3/16 (.188)

4.8

28

-

24

-

24

-

5/32 (.156)

4

26

-

22

-

22

-

1/8 (.125)

3.2

25

-

21

-

21

-

3/32 (.094)

2.4

23

-

20

-

20

-

1/16 (.063)

1.6

21

-

18

-

18

-


For all seamless and welded pipes produced to ASTM A333 specifications, except Grades 8 and 11, heat treatment must be applied to control microstructure through one of the following methods:

a. Normalization: Heat to a uniform temperature of no less than 1500 °F [815 °C] and cool either in air or within a controlled atmosphere furnace. Alternatively, normalize as described and, at the manufacturer's discretion, reheat to a suitable tempering temperature.

b. Seamless Pipes Only: Reheat and manage hot working processes so that the finishing temperature ranges between 1550 and 1750 °F [845 to 945 °C], and then cool in air or within a controlled atmosphere furnace from an initial temperature of no less than 1550 °F [845 °C]. Alternatively, treat as described and, at the manufacturer's discretion, reheat to a suitable tempering temperature.

c. Grades 1, 6, and 10: Heat to a uniform temperature of no less than 1500 °F [815 °C], followed by quenching in liquid and then reheating to a suitable tempering temperature.


For ASTM A333 Grade 8 pipe, heat treatment must be performed by either quenching and tempering or double normalization and tempering. For Grade 11, when required, the pipe must be annealed and then normalized in the temperature range of 1400 to 1600 °F [760 to 870 °C].

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