Digonal Wedge GOST Standard

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1.Dimensions: 180*95*120mm

2. Material: Ductile cast iron -120 (GOST 7293-85) (Correspond to QT1200-1 of GB/T1348-2009 )

3 Heat Treatment: Isothermal quenching Hardness: 341-344HB

4 . Accuracy of casting: 11-0-0-10 GOST 53464-2009.

5. Chemical composition Request:

3.4-3.6

2.3-2.5

0.2-0.4

≤0.03

≤≤0.02

≤0.05

≤0.4

≤1.5

0.04-0.06

≤0.04

≤0.3

≤0.04

≤0.05

6. Mechanical property

Uultimate tensile strengthMPa	Yield strengthMPa	Relative elongation	HardnessHB	Impact strength KVC at +20°KJ/m²	Impact strength KVC ar -60°KJ/m²
≥1200	≥850	≥1	341-444	80-90	50-60

7Body Organism:Tempered martensite

8. Modeling type: Adopts the coated sand molding Process , adopts the carbon-dioxide 650 hardened resin sand to make core.

9 Smelting Method: After having adopted intermediate frequency smelting liquid iron, scrap, nodular process and treated process, inoculating treatment by barium ferrosilicon, addition is 1.25%, the temperature of the melted iron is (1470—1510)°C, pouring temperature (1400-1420)°C

10 Heat treatment:isothermal quenching, adopts RT3-165-12 box resistor-stove to heat as austenitizing, heating temperature is 900±20°C,heat preservation for 90min. Isothermal quenching temperature is 270±15°C and heat preservation for 90min.

11 Chemical composition test: through director reader spectrograph to test the chemical ingredients

C	Si	Mn	P	S	Cu	Cr	Ni	Mg	Ti	Mo	Ai	V
3.45	2.45	0.26	0.022	0.017	0.28	0.002	0.001	0.045	0.01	0.2	0.03	0.002

12 Mechanical performance test

Uultimate tensile strengthMPa	Yield strengthMPa	Relative elongation	HardnessHB	Impact strength KVC at +20°KJ/m²	Impact strength KVC ar -60°KJ/m²
1250	876	1.6	366	86	57

13. Comprehensive tests shows that the appearance quality and the size have met the requirements of customers.