T8 Formstahl

Chemische Zusammensetzung

C	Si	Mn	P	S	Cr	Mo	Ni	Cu	V
0.75-0.85	0.2-0.4	0.2-0.4	0.03	0.03	3.75-4.5	0.4-1	0.3	0.25	1.80-2.40

Equivalent Grades of Steel

USA	Deutschland	Japan	Frankreich	England	China	Sweden	Inter
UNS	DIN	JIS	NF	BS	GB	SS	ISO
T72301	C80W2 (1.1625)	SK85 SK75	C80E2U	060A78 060A81	T8	1778	TC80

Mechanical properties of Steel

• Tensile strength：1158 MPa
• Elongation: 15%
• Modulus of elasticity: 190-210 GPa
• Poisson’s ratio: 0.27-0.3

Anmeldung

• Drills
• Planer tools
• Cutoff tools
• Roll-turning tools
• Lathe tools

Bedingungen für die Wärmebehandlung

• Critical point temperature: Ac1=730℃, Ar1=700℃, Ms=240℃
• Normalizing specification: normalizing temperature 800-820℃, hardness 241-302HBW
• Ordinary annealing specifications: 740-750℃×2-4h, cooling rate <30℃/h, slow cooling to 500-600℃ with the furnace, air cooling.
• Isothermal spheroidizing annealing specifications: 740-750℃×2-4h, cooled to 650-680℃×4-6h, furnace cooled to 500-600℃, air cooling, hardness ≤187HBW. 750-770℃×1-2h, cooled to 680-700℃×2-3h, furnace cooled to 500-600℃, air-cooled, hardness 163-187HBW, pearlite structure grade 1-5.
• Quenching + high temperature tempering spheroidization specifications: quenching temperature (800±10)℃, holding for 0.5h, water cooling, tempering temperature (700±10)℃, holding for 2h, furnace cooling to 550℃, air cooling, hardness 196-229HBW
• Quenching and tempering specifications: quenching temperature 770-790℃, water cooling or oil cooling, hardness ≥62HRC, tempering temperature 170-190℃.