ASTM A333 Standard Specification

ASTM A333 / A333M - 16 Standard Specification for Seamless and Welded Steel Pipe for Low-Temperature Service and Other Applications.

ASTM A333 alloy pipe shall be made by the seamless or welding process with the addition of no filler metal in the welding operation. All seamless and welded pipes shall be treated to control their microstructure.

A333 pipe is furnished to nine different grades designated by numbers 1, 3, 4, 6, 7, 8, 9, 10, & 11.

Sunny Steel Supply supplies a full range of ASTM A333 (ASME S/A 333)

Low Temperature Steel Pipe Specifications & Grades

Size range

Strike temperature condition:

Crade The lowest temperature for strike test
ASTM A333 Grade 1 -50 -45
ASTM A333 Grade 6 -50 -45

 Mechanical requiremnts of ASTM A333 alloy pipe

Grade Tensile Strength (MPa) Yield Point (MPa) Elongation (%)
Y X
Grade 1 ≥380 ≥205 ≥35 ≥25
Grade 3 ≥450 ≥240 ≥30 ≥20
Grade 4 ≥415 ≥240 ≥30 ≥16.5
Grade 6 ≥415 ≥240 ≥30 ≥16.5
Grade 7 ≥450 ≥240 ≥30 ≥22
Grade 8 ≥690 ≥515 ≥22
Grade 9 ≥435 ≥315 ≥28
Grade 10 ≥550 ≥450 ≥22
Grade 11 ≥450 ≥240 ≥18

 Chemical Composition (%) of ASTM A333 steel pipe

Grade Chemical Composition (%)
C Si Mn P S Cr Ni Cu Mo V Al
Grade 1 ≤0.30 0.40-1.06 ≤0.025 ≤0.025
Grade 3 ≤0.19 0.18-0.37 0.31-0.64 ≤0.025 ≤0.025 3.18-3.82
Grade 4 ≤0.12 0.18-0.37 0.50-1.05 ≤0.025 ≤0.025 0.44-1.01 0.47-0.98 0.40-0.75 0.04-0.30
Grade 6 ≤0.30 ≥0.10 0.29-1.06 ≤0.025 ≤0.025
Grade 7 ≤0.19 0.13-0.32 ≤0.90 ≤0.025 ≤0.025 2.03-2.57
Grade 8 ≤0.13 0.13-0.32 ≤0.90 ≤0.025 ≤0.025 8.40-9.60
Grade 9 ≤0.20 0.40-1.06 ≤0.025 ≤0.025 1.60-2.24 0.75-1.25
Grade 10 ≤0.20 0.10-0.35 1.15-1.50 ≤0.03 ≤0.015 ≤0.15 ≤0.25 ≤0.015 ≤0.50 ≤0.12 ≤0.06
Grade 11 ≤0.10 ≤0.35 ≤0.6 ≤0.025 ≤0.025 ≤0.50 35.0-37.0 ≤0.50

Heat Treatment:

Grades 1 and 6 shall be heat treated to control their microstructure.

ASTM A333 Grade 6 and ASME SA 333 Grade 6 are heat treated to achieve normalized condition @ 920 degrees Celsius with controlled microstructure.

Specific Impact requirements

The raw material used for low temperature service pipe is ALUMINIUM killed with high proportion of manganese (more than 1%) combined with low proportions of carbon (less than 0.23%).For low temperature pipe to be certified as LTCS additional impact test should be conducted at low temperatures, as per mandatory requirements in section 8 of ASTM A 333.

Production specification range of low temperature pipe products

No.
Order No.
Size description
O.D.
/mm
W.T.
/mm
Legnth
/m
1
A333 Gr.6
A333 Gr.6/X42NS
10~127
1~20
6~12.0
42~114.3
3.5~6
6~12.2
42~114.3
6~12
6~12.2
114.3~180
3.8~8
6~12.2
114.3~180
8~22
6~12.2
68~180
10~14
6~12.2
69~254
14~55
6~12.2
140~340
6~8
6~12.2
140~368
8~42
6~12.2
318~720
14~50
4~12.5
2
A333 Gr.6/X52QS
42~114.3
3.5~12
6~12.2
114.3~180
3.8~22
6~12.2
68~254
10~40
6~12.2
140~368
6~40
6~12.2
318~720
14~40
4~12.5
140~368
6~25
6~12.2
318~720
14~25
4~12.5
3
16MnDG
10~127
1~20
6~12.0
42~114.3
3.5~12
6~12.2
114.3~180
3.8~22
6~12.2
68~254
10~55
6~12.2
140~368
6~42
6~12.2
318~720
14~120
4~12.5

For low temperature

Production specification range of low temperature pipe products

Pipes are used in low temperature service

Steel pipes are produced accord to ASTM A333 standard

Q&A

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The most important and desired changes in alloy steel are:

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

  • Increased hardenability.
  • Increased corrosion resistance.
  • Retention of hardness and strength.

Nearly all alloy steels require heat treatment in order to bring out their best properties.

Alloying Elements & Their Effects

  • Chromium – Adds hardness. Increased toughness and wear resistance.
  • Cobalt – Used in making cutting tools; improved Hot Hardness (or Red Hardness).
  • Manganese – Increases surface hardness. Improves resistance to strain, hammering & shocks.
  • Molybdenum – Increases strength. Improves resistance to shock and heat.
  • Nickel – Increases strength & toughness. Improves corrosion resistance.
  • Tungsten – Adds hardness and improves grain structure. Provides improved heat resistance.
  • Vanadium – Increases strength, toughness and shock resistance. Improved corrosion resistance.
  • Chromium-Vanadium – Greatly improved tensile strength. It is hard but easy to bend and cut.
ASTM A335 P11 alloy pipe


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