A333 Gr.6 Gr.3 Low Temperature High Pressure Alloy Steel Pipe

A333 Gr.6 Gr.3 Low Temperature High Pressure Alloy Steel Pipe | Cryogenic Seamless Alloy Pipe

Excellent low‑temperature impact toughness, effectively avoid brittle fracture under cryogenic environment
Stable comprehensive mechanical performance for low‑temperature high‑pressure fluid transmission
Strict mandatory low‑temperature charpy impact test to guarantee operation safety
Multiple shape options: round, square, rectangular & custom special shapes
Suitable for liquefied gas, cold‑storage and large‑scale cryogenic engineering projects

Product Overview

ASTM A333 Gr.3 and A333 Gr.6 are seamless low‑temperature high‑pressure alloy steel pipes, specially designed for cryogenic service. A333 Gr.3 is nickel‑alloy grade with outstanding ultra‑low‑temperature impact resistance. A333 Gr.6 is carbon‑manganese grade widely used for medium low‑temperature piping. These pipes are adopted for liquefied‑gas transportation, low‑temperature pressure vessel, cold‑energy industry and cryogenic pipeline systems. We can supply round seamless pipe, square, rectangular alloy tubes and custom special‑shaped pipes according to client drawings. All products pass mandatory low‑temperature Charpy impact test. Full set of inspection documents can be provided for global cryogenic‑engineering buyers.

High Pressure Alloy Steel Pipe

Chemical & Mechanical Property Snapshot

Grade	C (%)	Si (%)	Mn (%)	Ni (%)	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Impact Test Temp
A333 Gr.3	≤0.19	0.18~0.37	0.80~1.20	3.20~3.80	≥240	450~600	≥30	-101℃
A333 Gr.6	≤0.30	≥0.10	0.29~1.06	—	≥240	415~655	≥30	-45℃

Detailed Technical Specifications

Item	Specification
Product Name	ASTM Low‑temperature High‑pressure Cryogenic Alloy Seamless Steel Pipe
Material Grades	A333 Gr.3, A333 Gr.6
Executive Standard	ASTM A333
Product Form	Seamless pipe: Round / Square / Rectangular / Custom special shape
Manufacturing Process	Hot‑rolled seamless / Cold‑drawn seamless
Heat Treatment	Normalizing / Normalizing & Tempering for cryogenic toughness
Outer Diameter Range	21.3mm ‑ 406.4mm
Wall Thickness Range	2.5mm ‑ 50mm
Available Length	Random length: 4‑12m; Fixed custom length: 1‑12m
Surface Condition	Black hot‑rolled surface / Anti‑rust oil / Black painting
Pipe End Treatment	Plain end / Bevel end for welding; plastic end caps protection
Mandatory Inspection	Hydrostatic test, Ultrasonic test(UT), chemical analysis, tensile test, hardness test, Low‑temperature Charpy V‑Notch impact test
Optional Inspection	MT, PT
Document & Certificate	Mill Test Certificate(MTC), full inspection report, heat‑number traceability document
MOQ(Minimum Order Quantity)	5 Ton; mixed sizes acceptable upon negotiation
Trade Terms	FOB, CFR, CIF, EXW
Payment Terms	T/T, L/C at sight
Packaging Detail	Both ends fitted with waterproof plastic caps; wrapped with waterproof kraft paper; bundled by high‑strength steel strips; wooden crate / pallet for special‑shaped pipe optional
Lead Time	20‑30 working days against deposit
Additional Available Service	Saw cutting, fixed‑length cutting, surface blasting, marking printing, custom‑shape fabrication per drawing

Shape Options

Available Pipe Shapes
Round High‑Pressure Alloy Pipe: Main product for boiler, heat‑exchanger, high‑pressure process pipeline, full Sch40‑Sch160 heavy wall sizes
Square Alloy Steel Pipe: Custom seamless square alloy tube for high‑pressure structural frame, pressure equipment support
Rectangular Alloy Steel Pipe: Custom seamless rectangular alloy profile for heavy‑duty industrial structural components
Special‑Shaped Alloy Pipe: Oval, hexagon and other special cross‑section, non‑standard dimension upon customer drawing

Dimension Reference Table

Outer Diameter	OD (inch)	Wall Thickness	WT (inch)
21.3 mm	0.84″	2.0 ~ 4.0 mm	0.079″ ~ 0.157″
33.7 mm	1.33″	2.5 ~ 6.0 mm	0.098″ ~ 0.236″
42.4 mm	1.67″	3.0 ~ 8.0 mm	0.118″ ~ 0.315″
48.3 mm	1.90″	3.0 ~ 10 mm	0.118″ ~ 0.394″
60.3 mm	2.37″	3.5 ~ 12 mm	0.138″ ~ 0.472″
88.9 mm	3.50″	4.0 ~ 16 mm	0.157″ ~ 0.630″
114.3 mm	4.50″	4.5 ~ 20 mm	0.177″ ~ 0.787″
168.3 mm	6.63″	6.0 ~ 25 mm	0.236″ ~ 0.984″

Product Comparison Table

Grade	Standard	Equivalent Grade	Main Application
A333 Gr.3	ASTM A333	EN 10216‑4 11MnNi5‑3	Ultra‑low‑temperature liquefied‑gas pipeline
A333 Gr.6	ASTM A333	Q345D seamless pipe	Medium low‑temperature pressure process pipe

App Market

Reliable Steel Coil Solutions For Diverse Industrial Applications

Coal Chemical Syngas Pipeline

High-Pressure Piping for Hydrocracking Units

Main Steam Pipeline of Thermal Power Plant Boilers

Product Packaging

Secure Export Packaging For Safe Handling And Delivery

FAQs

What is the working temperature range for A333 alloy pipe?

A333 Gr.3 suitable down to ‑101℃, A333 Gr.6 for ‑45℃ low‑temperature service.

MOQ for low temperature alloy pipe?

MOQ is 5 tons.

Can you cut pipe to custom length?

Yes, cut‑to‑length service available.

Can you make square & rectangular low temperature alloy pipe?

Yes, shaped alloy pipe can be produced with strict low‑temperature toughness requirement.

What packaging do you use for cryogenic alloy pipe?

Pipe ends with plastic caps, anti‑rust paper wrapped, steel strapping. Wooden case optional.

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A333 Gr.6 Gr.3 Low Temperature High Pressure Alloy Steel Pipe | Cryogenic Seamless Alloy Pipe