AISI 4340 1.6587 17hnm 18crnimo7-6 Alloy Spring Steel Rod Round Bar

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Ferrous Steel Scrap
• Technique: Forged
• Shape: Bar
• Surface Treatment: Machined
• Model NO.: Round bar
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel, Die Material
• Application: Tool Steel Bar
• Length: 2500-5500mm
• Transport Package: N/M
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7228400000
• Production Capacity: 5000ton/Month

Product Description

APPLICATION:

Alloyed case hardening steel for the parts which require core tensile strength and high hardness. Susceptible to the large seized parts with high wearing resistance and loading such as: gears, screws, camshafts, bushings.

TECHNOLOGICAL INFORMATION:

Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)

SEMI-FINISHED PRODUCTS:

Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)

CHEMICAL COMPOSITION:

C	Si	Mn	P	S	Cr	Mo	Ni	B
0,15 - 0,21	Max 0,40	0,50 - 0,90	Max 0,025	Max 0,035	1,50 - 1,80	0,25 - 0,35	1,40 - 1,70	-

MECHANICAL PROPERTIES:

Hardness after		Symbol	Value
Soft annealing (+A)		HB	≤ 229
Heat treatment (carburising, quenching and tempering) (+QT)		HRC	≥ 60
Ultimate tensile strength Rm, after quenching and tempering at 200 °C:
Diameter, d, mm	d ≤ 16	16 < d ≤ 40	40 < d ≤ 100
Rm, MPa	1160	1080	900

PHYSICAL PROPERTIES:

Property	Unit	Value
Density, ρ	g·cm^-3	7.85

TECHNOLOGICAL TREATMENT PROCESSES:

Technological treatment processes			Possible application	Temperature, °C
Hot forming	Forging		+	1150 - 850
	Rolling		+	1150 - 850
Thermochemical treatment	Carburising		+	880 - 980
	Carbonitriding		+	860 - 950
Heat treatment	Annealing	Normalising	+	830 - 870
		Soft annealing	+	650 - 700
	Heat treatment after carburising^1)	Core hardening	+	830 - 870
		Intermediate annealing	+	630 - 650
		Case hardening	+	780 - 820
		Tempering	+	150 - 200
^1)If possible, hardening has to be performed with the temperature equal or close to the heat treatment temperature

INTERNATIONAL STEEL GRADES:

ISO		CEN		Russia
~18CrNiMo7	ISO 683-11:1987	18CrNiMo7-6	EN 10084:1998	-	-
US		Japan		China