Low Temperature Seamless Steel Pipe

Forever Steel Manufacturing Co., Ltd
ASTM A333 seamless steel pipe,ASTM A333 Grade 6 pipe,low temperature steel pipe,A333 pipe,ASME SA333 pipe

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Low Temperature Seamless Steel Pipe

ASTM A333 Steel Pipe
ASTM A333 Grade 6 low temperature seamless steel pipe for LNG transport
Impact tested ASTM A333 Gr.6 seamless pipe for cold weather service

Standard: ASTM A333/A333M, ASME SA333
Material Grades: Grade 1, Grade 3, Grade 4, Grade 6, Grade 7, Grade 8, Grade 9, Grade 10, Grade 11
Outer Diameter: NPS 1/8" - NPS 20", 10.3 mm - 1219 mm
Wall Thickness: SCH 10, SCH 20, SCH STD, SCH 40, SCH 80, SCH XS, SCH 160, SCH XXS
Length: 20 ft - 40 ft, 5.8 m - 11.8 m, 6 m - 12 m
Ends: Plain, beveled, threaded
Coatings: 3LPE, FBE, galvanized
Applications: Low temperature service, pressure piping, oil and gas, petrochemical and industrial piping systems




  • Overview
  • Specification
  • Standard
  • Process
  • Packing

Low Temperature Seamless Steel Pipe (LTCS)–Premium Solutions for Cold Environments

Our Low Temperature Seamless Steel Pipes are specifically engineered to maintain superior impact toughness and structural integrity in sub-zero environments. Designed for applications where the process fluid or ambient temperature drops significantly, these pipes ensure safety and reliability under extreme thermal stress.


Common Standards and Steel Grades

We supply low-temperature pipes manufactured in strict accordance with international standards to meet the rigorous demands of the energy and chemical sectors:

ASTM A333: The standard specification for seamless and welded steel pipe for low-temperature service.

Grades: Grade 1, Grade 3, Grade 6 (most common), Grade 7, Grade 8, Grade 9.

ASME SA333: Parallel standards for pressure vessel and boiler construction.

ASTM A334: Seamless and welded carbon and alloy-steel tubes for low-temperature service.

EN 10216-4: European standard for seamless steel tubes for pressure purposes (e.g., P215NL, P265NL).


Dimensions and Size Range

Our production line covers a comprehensive range of sizes to fit diverse project requirements:


Feature    Specification Range

Outer Diameter (OD): 1/4”to 36”(13.7mm–914.4mm)

Wall Thickness (WT): SCH 10, SCH 20, SCH 40, SCH 80, SCH 160, XXS (up to 60mm)

Length: Single Random (5-7m), Double Random (10-12m), or Fixed Lengths

Ends: Plain End, Beveled End, Threaded & Coupled


Key Applications

These pipes are essential components in industries where "brittle fracture" must be prevented at low temperatures:

Oil & Gas: Arctic exploration, offshore drilling platforms, and low-temperature pipeline construction.

LNG Industry: Liquefied Natural Gas terminals, storage tanks, and transport piping.

Petrochemical: Ethylene plants, refrigeration units, and cryogenic processing facilities.

Power Generation: Specialized piping for low-temp compressed air and fluid handling.


Why Choose Our Low-Temp Pipes?

Impact Tested: Every batch undergoes Charpy V-Notch impact testing at temperatures as low as -45°C (for Grade 6) or -195°C (for Grade 8).

Precision Manufacturing: Advanced heat treatment (Normalizing or Quenching & Tempering) to ensure uniform grain structure.

Full Traceability: Supplied with MTC (Material Test Certificate) according to EN 10204 3.1 or 3.2.

Chemical composition

Element Grade 1 Grade 6 (Most Popular) Grade 3 Grade 7 Grade 9
Carbon (max) 0.3 0.3 0.19 0.19 0.2
Manganese 0.40–1.06 0.29–1.06 0.31–0.64 0.90 max 0.40–1.06
Phosphorus (max) 0.025 0.025 0.025 0.025 0.025
Sulfur (max) 0.025 0.025 0.025 0.025 0.025
Silicon ... 0.10 min 0.18–0.37 0.13–0.32 ...
Nickel ... ... 3.18–3.82 2.03–2.49 1.60–2.24
Copper ... ... ... ... 0.75–1.25


Dimention Tolerance

Nominal Pipe Size (NPS) OD Tolerance (Over) OD Tolerance (Under) Wall Thickness (WT) Tolerance Length Tolerance
Single Random (SRL) Double Random (DRL) Fixed Length
1/8" to 1-1/2" +0.4 mm (1/64") -0.8 mm (1/32") -12.5% (Min. Wall) ± 500mm ± 500mm +6mm / -0mm
Over 1-1/2" to 4" +0.8 mm (1/32") -0.8 mm (1/32") -12.5% (Min. Wall)
Over 4" to 8" +1.6 mm (1/16") -0.8 mm (1/32") -12.5% (Min. Wall)
Over 8" to 18" +2.4 mm (3/32") -0.8 mm (1/32") -12.5% (Min. Wall)
Over 18" to 36" +3.2 mm (1/8") -0.8 mm (1/32") -12.5% (Min. Wall)


MEchanical Properties sheet

Grade Tensile Strength (min) Yield Strength (min) Impact Test Temp. Min. Avg. Impact (3 Spec)
Grade 1 380 MPa (55 ksi) 205 MPa (30 ksi) -45°C (-50°F) 18 Joules (13 ft-lb)
Grade 3 450 MPa (65 ksi) 240 MPa (35 ksi) -100°C (-150°F) 18 Joules (13 ft-lb)
Grade 6 415 MPa (60 ksi) 240 MPa (35 ksi) -45°C (-50°F) 18 Joules (13 ft-lb)
Grade 7 450 MPa (65 ksi) 240 MPa (35 ksi) -75°C (-100°F) 18 Joules (13 ft-lb)
Grade 8 690 MPa (100 ksi) 515 MPa (75 ksi) -195°C (-320°F) 27 Joules (20 ft-lb)
Grade 9 435 MPa (63 ksi) 315 MPa (46 ksi) -75°C (-100°F) 27 Joules (20 ft-lb)

SPECIFICATION STANDARD (STEEL PIPE)

Normal Diameter OD(MM) WALL THICKMESS(MM)
ANSI B36.10M ANSI B36.19M
A(MM) B(INCH) ASME SCH5/5S SCH10S SCH10 SCH20 SCH30 STD SCH40 SCH40S SCH60 XS SCH80 SCH80S SCH100 SCH120 SCH140 SCH160 XXS
15 1/2" 21.34 1.65 2.11 2.11   2.41 2.77 2.77 2.77   3.73 3.73 3.73       4.78 7.47
20 3/4" 26.67 1.65 2.11 2.11   2.41 2.87 2.87 2.87   3.91 3.91 3.91       5.56 7.82
25 1" 33.40 1.65 2.77 2.77   2.9 3.38 3.38 3.38   4.55 4.55 4.55       6.35 9.09
32 1.1/4" 42.16 1.65 2.77 2.77   2.97 3.56 3.56 3.56   4.85 4.85 4.85       6.35 9.7
40 1.1/2" 48.26 1.65 2.77 2.77   3.18 3.68 3.68 3.68   5.08 5.08 5.08       7.14 10.15
50 2" 60.32 1.65 2.77 2.77   3.18 3.91 3.91 3.91   5.54 5.54 5.54       8.74 11.07
65 2.1/2" 73.02 2.11 3.05 3.05   4.78 5.16 5.16 5.16   7.01 7.01 7.01       9.53 14.02
80 3" 88.90 2.11 3.05 3.05   4.78 5.49 5.49 5.49   7.62 7.62 7.62       11.13 15.25
90 3.1/2" 101.60 2.11 3.05 3.05   4.78 5.74 5.74 5.74   8.08 8.08 8.08          
100 4" 114.30 2.11 3.05 3.05   4.78 6.02 6.02 6.02   8.56 8.56 8.56   11.13   13.49 17.12
125 5" 141.30 2.77 3.40 3.40     6.55 6.55 6.55   9.53 9.53 9.53   12.7   15.88 19.05
150 6" 168.28 2.77 3.40 3.40     7.11 7.11 7.11   10.97 10.97 10.97   14.27   18.26 21.95
200 8" 219.08 2.77 3.76 3.76 6.35 7.04 8.18 8.18 8.18 10.31 12.7 12.7 12.7 15.09 18.26 20.62 23.01 22.23
250 10" 273.05 3.40 4.19 4.19 6.35 7.8 9.27 9.27 9.27 12.7 12.7 15.09 12.7 18.26 21.44 25.4 28.58 25.4
300 12" 323.85 3.96 4.57 4.57 6.35 8.38 9.53 10.31 9.53 14.27 12.7 17.48 12.7 21.44 25.4 28.58 33.32 25.4
350 14" 355.60 3.96 4.78 6.35 7.92 9.53 9.53 11.13 9.53 15.09 12.7 19.05 12.7 23.83 27.79 31.75 35.71  
400 16" 406.40 4.19 4.78 6.35 7.92 9.53 9.53 12.7 9.53 16.66 12.7 21.44 12.7 26.19 30.96 36.53 40.49  
450 18" 457.20 4.19 4.78 6.35 7.92 11.13 9.53 14.27 9.53 19.05 12.7 23.83 12.7 29.36 34.93 39.67 45.24  
500 20" 508.00 4.78 5.54 6.35 9.53 12.7 9.53 15.09 9.53 20.62 12.7 26.19 12.7 32.54 38.1 44.45 50.01  
550 22" 558.80 4.78 5.54 6.35 9.53 12.7 9.53     22.23 12.7 28.58   34.93 41.28 47.63 53.98  
600 24" 609.60 5.54 6.35 6.35 9.53 14.27 9.53 17.48 9.53 24.61 12.7 30.96 12.7 38.89 46.02 52.37 59.54  
650 26" 660.40     7.92 12.7   9.53       12.7              
700 28" 711.20     7.92 12.7 15.88 9.53       12.7              
750 30" 762.00 6.35   7.92 12.7 15.88 9.53       12.7              
800 32" 812.00     7.92 12.7 15.88 9.53 17.48     12.7              
850 34" 863.60     7.92 12.7 15.88 9.53 17.48     12.7              
900 36" 914.40     7.92 12.7 15.88 9.53 19.05     12.7              

Low Temperature Seamless Steel Pipe Production Process

Chemical composition

Element Grade 1 Grade 6 (Most Popular) Grade 3 Grade 7 Grade 9
Carbon (max) 0.3 0.3 0.19 0.19 0.2
Manganese 0.40–1.06 0.29–1.06 0.31–0.64 0.90 max 0.40–1.06
Phosphorus (max) 0.025 0.025 0.025 0.025 0.025
Sulfur (max) 0.025 0.025 0.025 0.025 0.025
Silicon ... 0.10 min 0.18–0.37 0.13–0.32 ...
Nickel ... ... 3.18–3.82 2.03–2.49 1.60–2.24
Copper ... ... ... ... 0.75–1.25


Dimention Tolerance

Nominal Pipe Size (NPS) OD Tolerance (Over) OD Tolerance (Under) Wall Thickness (WT) Tolerance Length Tolerance
Single Random (SRL) Double Random (DRL) Fixed Length
1/8" to 1-1/2" +0.4 mm (1/64") -0.8 mm (1/32") -12.5% (Min. Wall) ± 500mm ± 500mm +6mm / -0mm
Over 1-1/2" to 4" +0.8 mm (1/32") -0.8 mm (1/32") -12.5% (Min. Wall)
Over 4" to 8" +1.6 mm (1/16") -0.8 mm (1/32") -12.5% (Min. Wall)
Over 8" to 18" +2.4 mm (3/32") -0.8 mm (1/32") -12.5% (Min. Wall)
Over 18" to 36" +3.2 mm (1/8") -0.8 mm (1/32") -12.5% (Min. Wall)


MEchanical Properties sheet

Grade Tensile Strength (min) Yield Strength (min) Impact Test Temp. Min. Avg. Impact (3 Spec)
Grade 1 380 MPa (55 ksi) 205 MPa (30 ksi) -45°C (-50°F) 18 Joules (13 ft-lb)
Grade 3 450 MPa (65 ksi) 240 MPa (35 ksi) -100°C (-150°F) 18 Joules (13 ft-lb)
Grade 6 415 MPa (60 ksi) 240 MPa (35 ksi) -45°C (-50°F) 18 Joules (13 ft-lb)
Grade 7 450 MPa (65 ksi) 240 MPa (35 ksi) -75°C (-100°F) 18 Joules (13 ft-lb)
Grade 8 690 MPa (100 ksi) 515 MPa (75 ksi) -195°C (-320°F) 27 Joules (20 ft-lb)
Grade 9 435 MPa (63 ksi) 315 MPa (46 ksi) -75°C (-100°F) 27 Joules (20 ft-lb)

SPECIFICATION STANDARD (STEEL PIPE)

Normal Diameter OD(MM) WALL THICKMESS(MM)
ANSI B36.10M ANSI B36.19M
A(MM) B(INCH) ASME SCH5/5S SCH10S SCH10 SCH20 SCH30 STD SCH40 SCH40S SCH60 XS SCH80 SCH80S SCH100 SCH120 SCH140 SCH160 XXS
15 1/2" 21.34 1.65 2.11 2.11   2.41 2.77 2.77 2.77   3.73 3.73 3.73       4.78 7.47
20 3/4" 26.67 1.65 2.11 2.11   2.41 2.87 2.87 2.87   3.91 3.91 3.91       5.56 7.82
25 1" 33.40 1.65 2.77 2.77   2.9 3.38 3.38 3.38   4.55 4.55 4.55       6.35 9.09
32 1.1/4" 42.16 1.65 2.77 2.77   2.97 3.56 3.56 3.56   4.85 4.85 4.85       6.35 9.7
40 1.1/2" 48.26 1.65 2.77 2.77   3.18 3.68 3.68 3.68   5.08 5.08 5.08       7.14 10.15
50 2" 60.32 1.65 2.77 2.77   3.18 3.91 3.91 3.91   5.54 5.54 5.54       8.74 11.07
65 2.1/2" 73.02 2.11 3.05 3.05   4.78 5.16 5.16 5.16   7.01 7.01 7.01       9.53 14.02
80 3" 88.90 2.11 3.05 3.05   4.78 5.49 5.49 5.49   7.62 7.62 7.62       11.13 15.25
90 3.1/2" 101.60 2.11 3.05 3.05   4.78 5.74 5.74 5.74   8.08 8.08 8.08          
100 4" 114.30 2.11 3.05 3.05   4.78 6.02 6.02 6.02   8.56 8.56 8.56   11.13   13.49 17.12
125 5" 141.30 2.77 3.40 3.40     6.55 6.55 6.55   9.53 9.53 9.53   12.7   15.88 19.05
150 6" 168.28 2.77 3.40 3.40     7.11 7.11 7.11   10.97 10.97 10.97   14.27   18.26 21.95
200 8" 219.08 2.77 3.76 3.76 6.35 7.04 8.18 8.18 8.18 10.31 12.7 12.7 12.7 15.09 18.26 20.62 23.01 22.23
250 10" 273.05 3.40 4.19 4.19 6.35 7.8 9.27 9.27 9.27 12.7 12.7 15.09 12.7 18.26 21.44 25.4 28.58 25.4
300 12" 323.85 3.96 4.57 4.57 6.35 8.38 9.53 10.31 9.53 14.27 12.7 17.48 12.7 21.44 25.4 28.58 33.32 25.4
350 14" 355.60 3.96 4.78 6.35 7.92 9.53 9.53 11.13 9.53 15.09 12.7 19.05 12.7 23.83 27.79 31.75 35.71  
400 16" 406.40 4.19 4.78 6.35 7.92 9.53 9.53 12.7 9.53 16.66 12.7 21.44 12.7 26.19 30.96 36.53 40.49  
450 18" 457.20 4.19 4.78 6.35 7.92 11.13 9.53 14.27 9.53 19.05 12.7 23.83 12.7 29.36 34.93 39.67 45.24  
500 20" 508.00 4.78 5.54 6.35 9.53 12.7 9.53 15.09 9.53 20.62 12.7 26.19 12.7 32.54 38.1 44.45 50.01  
550 22" 558.80 4.78 5.54 6.35 9.53 12.7 9.53     22.23 12.7 28.58   34.93 41.28 47.63 53.98  
600 24" 609.60 5.54 6.35 6.35 9.53 14.27 9.53 17.48 9.53 24.61 12.7 30.96 12.7 38.89 46.02 52.37 59.54  
650 26" 660.40     7.92 12.7   9.53       12.7              
700 28" 711.20     7.92 12.7 15.88 9.53       12.7              
750 30" 762.00 6.35   7.92 12.7 15.88 9.53       12.7              
800 32" 812.00     7.92 12.7 15.88 9.53 17.48     12.7              
850 34" 863.60     7.92 12.7 15.88 9.53 17.48     12.7              
900 36" 914.40     7.92 12.7 15.88 9.53 19.05     12.7              

Low Temperature Seamless Steel Pipe Production Process

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ASTM A333 Grade 6 Seamless Pipe,Low Temperature Steel Pipe

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