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Heat Exchanger Tube

ASTM A334 / ASME SA334 Gr.6 Carbon Steel Tube Low-Temperature Heat Exchanger Tube

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ASTM A334 / ASME SA334 Gr.6 Carbon Steel Tube Low-Temperature Heat Exchanger Tube

Brand Name:	YUHONG
Model Number:	ASTM A334 Gr.6 Carbon Steel Seamless Tube
MOQ:	1000kgs
Packaging Details:	Ply-wooden Case /Iron Case/ Bundle with plastic Cap
Payment Terms:	L/C,T/T

Detail Information

Product Description

Ratings & Reviews

Detail Information

Place of Origin:

CHINA

Certification:

ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2008

Product Name:

Heat Exchanger Tube

Standard:

ASTM A334, ASME SA334

Material:

Grade 6

1/4" , 3/8", 1/2", 5/8", 3/4", 1", 1.1/4", Etc.

Thickness:

BWG10-25

Length:

Single Random, Double Random & Cut Length

Plain End, Beveled End

Highlight:

ASTM A334 Gr.6 Carbon Steel Seamless Tube, Heat Exchanger Tube, Low-Temperature Service

Product Description

ASTM A334 / ASME SA334 Grade 6 Carbon Steel Seamless Tube Low-Temperature Heat Exchanger Tube

For heat exchanger services operating in arctic climates or cryogenic processing plants, engineers typically specify ASME SA334 Grade 6 seamless tubing. This grade is essentially a fine-grain, killed carbon steel that undergoes normalizing to achieve a uniform ferrite-pearlite structure. Its key distinction from standard boiler tubes is the mandatory impact testing at -45°C, which guarantees ductility below the ductile-to-brittle transition point. While it is more costly than standard carbon steel, it is far more economical than switching to stainless steels for temperatures down to -50°F.

The Critical Link: The Material (Grade 6)

Both standards specify the exact same material for Grade 6. It is a seamless or welded 3.5% Nickel steel designed specifically to retain ductility and resist brittle fracture at temperatures as low as -50°F (-45°C).

You can think of it this way:

Grade 6 (3.5% Nickel Steel) is the material recipe.
ASTM A333 is the rulebook for making that material into pipe.
ASTM A334 is the rulebook for making that material into heat exchanger tube.

A334 Gr. 6 vs. A333 Gr. 6: They share the same chemistry and impact requirements. A333 is the specification for Pipe (used for welding fittings and pipelines). A334 is the specification for Tube (used for heat exchangers). The dimensional tolerances (ASTM A450 vs. A530) and inspection criteria differ.

Chemical Composition % of ASTM A334 / ASME SA334 Gr.6 Carbon Steel Seamless Tube

Standard	Material	C		Mn	Si	P	S
ASTM A334 / ASME SA334	Gr.6	0.30 max		0.29-1.06	0.10min	0.025	0.025

Mechanical Properties of ASTM A334 / ASME SA334 Gr.6 Carbon Steel Seamless Tube

GRADE	Tensile Strength, min ksi [MPa]	Yield Strength, min ksi [MPa]	Elongation in 2 in. or 50 mm, min, %	Low degree of Temperature test
Gr.6	415 [60]	240 [35]	30	-45°

Heat Treatment (Normalizing)

To achieve the required grain structure and mechanical properties, the tubes must be heat treated. For Grade 6, the typical heat treatment is Normalizing.

Process: Heating the steel to a uniform temperature above its critical range (typically around 1650°F / 900°C) and then cooling in air.
Purpose: This refines the grain structure, ensuring uniform mechanical properties and enhancing low-temperature toughness.

Application

Because of these properties, SA334 Grade 6 seamless tubes are used specifically where the metal temperature drops below the limits of standard carbon steel (like A179 or A210). Common applications include:

Cryogenic Gas Processing: Heat exchangers in plants processing Liquid Natural Gas (LNG), ethylene, or propane.
Refrigeration Systems: Industrial refrigeration units where temperatures drop significantly.
Northern Pipelines and Facilities: Heat exchangers located in arctic environments where ambient temperatures are extreme.
Air Separation Units: Plants that separate oxygen and nitrogen from the air (operating at cryogenic temperatures).

Ratings & Review

Overall Rating

4.3

Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings

5 stars

67%

4 stars

3 stars

33%

2 stars

1 stars

All Reviews

Berrada

Morocco Jan 30.2026

Helpful (2)

We're dealing with aggressive fluids on the tube side. So far, no pitting or issues.

Sajid

Pakistan Jan 12.2026

Helpful (4)

Tube ends were clean, dimensions accurate. Our fitters didn't complain about fit-up.

J*o

Spain Oct 17.2025

Helpful (3)

Really good quality, the ASME SA249 standard is the real deal. I was worried about the fins getting crushed during the long trip, but the packaging was top-notch—not a single one was bent.

Tags:

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube

Copper Alloy Steel Heat Exchanger Tube

Titanium Alloy Steel Heat Exchanger Tube

Alloy Steel Heat Exchanger Tube

U Bend Heat Exchanger Tube

Carbon Steel Heat Exchanger Tubes

Boiler Tube

Nickel Alloy Steel Boiler Tube

Stainless Steel Boiler Tube

Duplex Stainless Steel Boiler Tube

Alloy Steel Boiler Tube

Carbon Steel Boiler Tube

Fired Heater Parts

Baffle Plate

Tubesheet

products details

Studded Tube

Solid Fin Tube

Serrated Finned tube

Embedded G Fin Tube

Extruded Fin Tube

Wound Fin Tube

Low Fin Tube

Square Fin Tube

Longitudinal Finned Tube

Enhanced Heat Transfer Tube

Fin Tube Support

Return Bend

Heat Exchanger Tube

Stainless Steel Heat Exchanger Tube

Duplex Stainless Steel Heat Exchanger Tube

Super Duplex Stainless Steel Heat Exchanger Tube

Nickel Alloy Steel Heat Exchanger Tube