A333 GR6 LTCS Pipe Description
ASTM A333 Gr.6 is the American Society for Testing and Materials (ASTM) standard for seamless steel tubing for cryogenic applications (ASTM A333/A333M). ASTM A333 Gr.6 is a standard for seamless pipe for cryogenic applications (ASTM A333/A333M) developed by the American Society for Testing and Materials (ASTM) for use in very low-temperature environments in the range of -45°C to -195°C, such as liquefied natural gas (LNG) storage and transport, cryogenic heat exchangers, and other high-pressure vessel piping systems.
Its core properties include:
Low-temperature toughness: Composition optimisation and heat treatment processes avoid brittle fracture at low temperatures, guaranteeing safety in extreme environments.
Nickel-free design: Earlier versions were nickel-free carbon-manganese steels, and after 2016 the standard was updated to allow for the addition of trace alloying elements (e.g., Cr, Ni, etc.), while still maintaining low-alloy properties.
A333 GR 6 hot-rolled steel pipes
A333 GR6 Seamless Pipe Specification
Product specifications:
outer diameter 21.3mm~762mm, wall thickness 2.0mm~140mm
Heat treatment requirements for SA 333 GR 6 tube:
1. Normalizing above 815°C.
2. Normalizing above 815°C, then tempering.
3. Hot forming between 845-945°C, then furnace cooling above 845°C (applicable only to seamless tubes).
4. Tempering after processing.
5. Quenching above 815°C, then tempering.
Chemical composition and alloy design
- Base composition (mass per cent)
| element | C | Mn | Si | P | S |
|---|---|---|---|---|---|
| content | ≤0.30% | 0.29~1.06% | ≤0.40% | ≤0.025% | ≤0.025% |
Low carbon and low impurities: strict control of carbon, phosphorus and sulphur content to reduce the risk of low-temperature brittleness
- Alloy Reinforcement (updated for 2016)
New elements such as Cr, Ni, Mo, Cu, V, Nb, etc. (total ≤ 1.5%) are added to improve low-temperature toughness through grain refinement and austenite stabilisation.
Mechanical Properties and Key Characteristics
| Terms | tensile strength(≥) | yield strength(≥) | elongation(≥) | low-temperature shock function(-45℃) |
|---|---|---|---|---|
| numeric | 415 MPa | 240 MPa | 30% | ≥20 J(transverse sample) |
Applications:
- Energy industry: LNG liquefied natural gas pipelines, deep-cooling storage tanks and delivery systems.
- Chemical equipment: ethylene crackers and polypropylene reactors, particularly in cryogenic circulation piping.
- Extreme environment: Arctic / Antarctic oil and gas fields, as well as in ultra-low temperature laboratory equipment pipelines.
Precautions for the use of A333 GR6 steel pipe:
- Temperature limitation: It is essential to prohibit long-term use of A333 GR6 steel pipe at design temperatures higher than -45℃ to avoid degradation of material properties.
- Welding process: Low hydrogen welding consumables and preheating are required to prevent cold cracking in the weld area.
- Corrosion protection: Additional surface coating or cathodic protection is required when exposed to wet or corrosive environments.
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FAQ
Q: Do you have quality control system?
We have a quality control system in place, which includes our own quality control laboratory.Additionally, third-party testing services are also available.
Q. Can you provide samples?
We can provide samples at no cost to you, but you will be responsible for the shipping costs.
Q.What is the delivery time?
Our delivery time is typically within 7-15 days after we confirm your request.
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