JIS G3460 Carbon Steel Pipes for Low Temperature Service

Introduction

JIS G3460 is a Japanese industrial standard that specifies the requirements for carbon steel pipes used for low temperature service. These pipes are commonly utilized in various industries including petrochemical, gas, and oil refineries.

Material and Specification

The JIS G3460 standard covers seamless and welded carbon steel pipes intended for low temperature service. These pipes are made using steel grades such as STPL380, STPL450, and STPL690. The standard specifies the dimensions, tolerances, weight, and technical requirements for these pipes.

Key Features

The carbon steel pipes under JIS G3460 exhibit several key features that make them suitable for low temperature service. Some of these features include:

1. High Strength: The carbon steel pipes possess high strength, enabling them to withstand low temperatures and pressure conditions effectively.
2. Good Toughness: These pipes exhibit excellent toughness, which is crucial in low temperature environments to ensure resistance against brittle fracture.
3. Corrosion Resistance: JIS G3460 pipes are designed to resist corrosion, extending their lifespan and maintaining their performance in demanding conditions.
4. Cost-Effective: Carbon steel pipes are generally more cost-effective compared to other alloys, making them a popular choice for low temperature applications.

Chemical Composition

Steel Grade	Chemical Composition
STPL380	C: 0.25-0.32%<br>Mn: 0.30-0.90%<br>P: 0.030% max<br>S: 0.030% max
STPL450	C: 0.25-0.32%<br>Mn: 0.30-0.90%<br>P: 0.030% max<br>S: 0.030% max
STPL690	C: 0.25-0.32%<br>Mn: 0.30-0.90%<br>P: 0.030% max<br>S: 0.030% max

Note: The chemical composition may vary slightly depending on the specific steel manufacturer.

Mechanical Properties

Steel Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)
STPL380	380 min	220 min	25 min
STPL450	450 min	275 min	22 min
STPL690	690 min	490 min	18 min

Steel Grade and Application

JIS G3460 consists of multiple steel grades, each suited for different applications. Here are some of the commonly used steel grades and their applications:

1. STPL380: Used for low temperature piping systems in industries such as chemical plants, oil refineries, and power generation.
2. STPL450: Suitable for low temperature service in cryogenic storage tanks, heat exchangers, and liquefied natural gas (LNG) facilities.
3. STPL690: Primarily used in offshore platforms, polar regions, and other extreme low temperature environments where high strength and toughness are required.

Possible Alternative Grades

While JIS G3460 specifies the mentioned steel grades for low temperature service, certain alternative grades may also be viable options depending on specific requirements. Some possible alternative grades that exhibit similar properties include ASTM A333 Gr.6, ASTM A420-WPL6, and API 5L Grade X65.

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