JFE Steel Corporation

Products & Technology

High Tensile Strength Steel Plate
　　　　　　　　　　　for Construction Machinery

Available in a wide range of strength grades and sizes

This lineup of high-tensile strength steel plate spans a tensile strength range from 590 to 980 N/mm². JFE also offers two high-yield strength plate products, HYD960LE and HYD1100LE, for applications requiring even greater strength.
The chemical composition of these products was carefully designed to ensure excellent weldability. This steel plate is guaranteed to maintain its toughness at low temperatures, making it suitable for construction machinery that needs to operate under extreme weather conditions.

Features

High-tensile strength steel plate lineup ranging in tensile strength from 590 to 980 N/mm²
Available in very high thicknesses, over 100 mm
HYD960LE and HYD1100LE high-yield steel is also offered for applications requiring exceptionally high strength
Excellent weldability
Guaranteed toughness at low temperatures ‒40°C

Examples of Product Characteristics

Results of y-groove weld cracking test on JFE-HITEN 780LE

No low-temperature cracking occurred, even at a preheat temperature of 25°C. The ability to reduce preheat temperature enables greater work efficiency.

Table of Grades

Type/grade	Thickness (mm)	Ceq. (%)	Tensile test		Charpy impact test		Heat treat ment
			Yield strength (MPa) t(mm)	Tenslie strength (MPa)	Test temperatrue (℃) t(mm)	Energy (J)

Standard Series	JFE-HITEN 590SA	6～40	≦0.45	≧450	590～710	―	―	CR or TMCP
	JFE-HITEN 590SB	6～40	≦0.45	≧450	590～710	-10(ｔ>12)	≧47
	JFE-HITEN 590SL	6～32	≦0.46	≧450	590～710	-40(6≦ｔ≦36) -20(ｔ>36)	≧27
	JFE-HITEN 590SL	32.1～50	≦0.46	≧430	570～705	-40(6≦ｔ≦36) -20(ｔ>36)	≧27
	JFE-HITEN 690S	6～25	≦0.50	≧550	690～830	-10(ｔ>12)	≧47
	JFE-HITEN 780S	6～50	≦0.53	≧685(ｔ≦75) ≧665(ｔ>75)	780～930	-5(12<ｔ≦20) -15(20<ｔ≦32) -20(32<ｔ)	≧35	QT
		50.1～100	≦0.61
		100.1～160	≦0.70
		160.1～203.2	≦0.75	≧610	700～850	-40
	JFE-HITEN 980S	6～50	≦0.65	≧885	950～1130	-10(12<ｔ≦20) -25(20<ｔ≦32) -30(32<ｔ)	≧35	QT

LE (high toughne ss series)	JFE-HITEN 780LE	6～19	≦0.40*	≧685	780～930	-40	≧40	QT or TMCP
		19.1～32	≦0.43*
		32.1～40	≦0.47*
	(Not yet officially standardized but can be ordered.)	40.1～70	≦0.65*	≧685(ｔ≦75) ≧665(ｔ>75)	780～930	-40	≧40	QT
		70.1～160	≦0.73*
		160.1～203.2	≦0.78*	≧610	700～850		≧35
	JFE-HITEN 980LE (Not yet officially standardized but can be ordered.)	6～50	≦0.65*	≧900	940～1100	-40	≧35	QT
		50.1～100	≦0.80*	≧830	880～1080
	JFE-HYD 960LE	6～32	≦0.64*	≧960	980～1150	-40	≧27	TMCP or QT
		32.1～50.8	≦0.70*
		50.9～63.5		≧930	950～1120
	JFE-HYD 1100LE	12～32	≦0.70*	≧1100	1180～1500	-40	≧27

※): C+Mn/６+(Cu+Ni)/１５+(Cr+Mo+V)/５
other case: C+Si/２４+Mn/６+Ni/４０+Cr/５+Mo/４+V/１４

CR: Control rolling
TMCP: Thermo-Mechanical Control Process
QT: Quenching-Tempering