ASTM A333 Grade 1 Seamless Precision Steel Tube For Low-Temperature Service

ASTM A333 Grade 1, 3, 4, 6, 7 Seamless Precision Steel Tube for Low-Temperature Service

Introduction

ASTM A333 is a specification that covers seamless and welded steel pipe for low-temperature service. The grades included in this specification are designed to provide excellent mechanical properties and impact toughness at low temperatures, making them suitable for various applications in the oil and gas industry, as well as in cryogenic services.

Material

The materials used in the production of ASTM A333 seamless precision steel tubes are carbon and alloy steels. These materials are selected for their ability to withstand low temperatures while maintaining structural integrity.

Specification

ASTM A333 is divided into several grades, each with specific requirements regarding chemical composition and mechanical properties. The grades covered under this specification include:

• Grade 1
• Grade 3
• Grade 4
• Grade 6
• Grade 7

Chemical Composition

The following table presents the chemical composition requirements for ASTM A333 Grades 1, 3, 4, 6, and 7:

Grade	Carbon (C)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)	Nickel (Ni)	Chromium (Cr)	Molybdenum (Mo)
1	≤ 0.18	0.30 - 0.90	≤ 0.025	≤ 0.025	-	-	-
3	≤ 0.18	0.30 - 0.90	≤ 0.025	≤ 0.025	0.40 - 0.70	-	-
4	≤ 0.20	0.30 - 0.90	≤ 0.025	≤ 0.025	0.40 - 0.70	0.40 - 0.60	-
6	≤ 0.20	0.30 - 0.90	≤ 0.025	≤ 0.025	0.40 - 0.70	0.40 - 0.60	0.15 - 0.25
7	≤ 0.20	0.30 - 0.90	≤ 0.025	≤ 0.025	0.40 - 0.70	0.40 - 0.60	0.15 - 0.25

Mechanical Properties

The mechanical properties of ASTM A333 seamless precision steel tubes are crucial for their performance in low-temperature environments. The following table summarizes the mechanical properties for each grade:

Grade	Yield Strength (min)	Tensile Strength (min)	Elongation (min)	Impact Test (min)
1	205 MPa (30 ksi)	310 MPa (45 ksi)	30%	-
3	205 MPa (30 ksi)	310 MPa (45 ksi)	30%	-
4	240 MPa (35 ksi)	415 MPa (60 ksi)	30%	-
6	240 MPa (35 ksi)	415 MPa (60 ksi)	30%	27 J (20 ft-lb)
7	240 MPa (35 ksi)	415 MPa (60 ksi)	30%	27 J (20 ft-lb)

Application

ASTM A333 seamless precision steel tubes are widely used in various applications, particularly in industries that require materials capable of performing under low-temperature conditions. Some common applications include:

• Oil and Gas Pipelines: Transporting natural gas and oil at low temperatures.
• Cryogenic Equipment: Used in the storage and transportation of liquefied gases.
• Pressure Vessels: For low-temperature service in chemical processing.
• Heat Exchangers: In refrigeration and air conditioning systems.

Conclusion

ASTM A333 Grades 1, 3, 4, 6, and 7 seamless precision steel tubes are essential materials for low-temperature applications. Their specific chemical compositions and mechanical properties ensure reliability and safety in demanding environments, making them a preferred choice in various industrial sectors.

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