JIS G3136 Standard: Hot-Rolled Steel Plates for Construction (SN400, SN490)

JIS G3136 is a Japanese Industrial Standard specifying hot-rolled steel plates for construction machinery and structural applications, such as cranes, excavators, bulldozers, and other heavy equipment. The standard focuses on steel plates with excellent weldability, formability, and sufficient strength to withstand dynamic loads in construction environments. Two key grades under this standard are SN400 and SN490.

1. General Overview of JIS G3136

Scope: Covers hot-rolled steel plates for welded structures in construction machinery, where toughness and weldability are critical.

Key Features: Compared to general structural steels (e.g., JIS G3101 SS400), JIS G3136 grades have stricter controls on impurities (e.g., sulfur, phosphorus) and enhanced low-temperature toughness, making them suitable for load-bearing components in heavy machinery.

 

 

 

 

 

 

 

2. Grades: SN400 and SN490

The grades are distinguished by their minimum tensile strength:

 

SN400: Minimum tensile strength of 400 MPa.

SN490: Minimum tensile strength of 490 MPa (higher strength than SN400).

 

Both grades are further divided into subgrades based on impact toughness requirements, denoted by suffixes (e.g., SN400A, SN400B; SN490A, SN490B, SN490C). The suffixes indicate differences in impact test conditions:

 

Subgrade	Impact Test Temperature	Impact Energy Requirement
A	No impact test required	N/A
B	Room temperature (20°C)	≥27 J
C	0°C	≥27 J

 

 

 

 

 

 

 

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