Ningbo ASTM A333 Seamless Pipe

QS Steel Pipe: Ningbo ASTM A333 Seamless Pipe

Name: Ningbo ASTM A333 Seamless Pipe
Standard: ASTM
Type: Seamless
Material: A333 Gr.6
Size: 60mm
Schedule: 12
Surface of Pipe: Normal Blue
Application: For Low-temperature Pressure Vessels and Heat Exchangers at -45℃.

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ASTM A333 Seamless Pipe — High-Performance Piping Solution for Low-Temperature Environments.
The ASTM A333 Gr.6 Seamless Pipe is a seamless steel pipe specifically designed for low-temperature service down to -45℃, fully compliant with ASTM standards. Manufactured through advanced seamless processes, it guarantees structural uniformity, high strength, and exceptional impact toughness at cryogenic temperatures. Widely used in critical applications such as LNG (liquefied natural gas) transfer systems, low-temperature pressure vessel piping, and heat exchangers. Standard specifications include 60mm×12mm (wall thickness), with blue paint coating for industry compliance and identification.

Standards & Specifications
- Certification: ASTM A333 Seamless Pipe strictly conforms to ASTM A333 (Standard Specification for Seamless Steel Pipe for Low-Temperature Service).

- Grade: Grade 6 (optimized for low-temperature toughness).

- Scope: Covers chemical composition, mechanical properties, dimensional tolerances, heat treatment, and cryogenic impact testing requirements.

Chemical Composition (Ladle Analysis)
The ASTM A333 Seamless Pipe must meet the following key chemical composition limits (wt%):

Element	C	Mn	P	S	Si	Ni	Cu
Content	≤0.30	0.29–1.06	≤0.025	≤0.025	≥0.10	≤0.40	≤0.40

Notes:
- Residual elements (Cr, Mo, V, etc.) ≤1% total to ensure weldability of ASTM A333 Gr.6 Seamless Pipe.
- Copper content negotiable up to 0.50% (subject to additional performance validation).

Mechanical Properties
Key mechanical properties of ASTM A333 Gr.6 Seamless Pipe:

Property	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%) (50mm gauge)	Impact Energy (J) (-45℃)
Requirement	≥415	≥240	≥30	≥20 (single)/≥25 (average)

Key Points of Low-Temperature Impact Testing:
- Sample Type: Charpy V-notch, simulating extreme low-temperature conditions.

- Test Condition: -45℃ (or lower as specified) to validate the reliability of ASTM A333 Gr.6 Seamless Pipe.

Manufacturing Process & Heat Treatment
- Seamless Process: Hot rolled or cold drawn to ensure defect-free ASTM A333 Seamless Pipe.

- Heat Treatment:
- Normalizing: Heated to 900℃–950℃ followed by air cooling to refine grain structure.
- Normalizing + Tempering (N&T): Applied for enhanced dimensional stability.

- Grain Size: ASTM E112 Grade 5–8, optimized for low-temperature toughness.

Dimensions & Tolerances
Per ASTM A333/A333M and ASME B36.10M:
- OD Range: 1/8"–24"(DN6–DN600), covering most low-temperature piping needs.
- Wall Thickness Tolerance: ±10% (min. ±0.3mm) to ensure pressure integrity of ASTM A333 Seamless Pipe.

Testing & Quality Control
- NDT: 100% eddy current (ET) or ultrasonic (UT) testing to eliminate defects.
- Hydrostatic Test: Pressure calculated per formula (typically ≥5MPa), held for ≥5 seconds.
- Batch Testing: 3 impact test specimens per batch of ASTM A333 Gr.6 Seamless Pipe.

Applications
- LNG Infrastructure: Transfer pipelines, storage systems.
- Energy Sector: Cryogenic separation units, refining equipment.
- Chemical Plants: Reactors and exchangers below -45℃.

Comparison with Other Standards

Standard	Low-Temperature Performance	Chemical Differences
EN 10216-4	P265NL (similar impact energy)	Higher Ni limit (≤1.0%)
GB/T 18984	L245N (tested at -30℃)	Lower carbon equivalent requirement

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