GGG50 Ductile Iron Castings

Product Description

GGG50 Ductile Iron Castings corresponds to the Chinese brand QT450-10. The meaning of QT450-10 is as follows:

(1) 10 means elongation ≥ 10%;

(2) QT means nodular cast iron;

(3) 450 means that the tensile strength is ≥450MPa.

British grade 420/12, American grade 65-45-12, international standard 450-10

Nodular cast iron is obtained by spheroidizing and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially its plasticity and toughness, so as to obtain higher strength than carbon steel. It has been successfully used in the casting of complex stress, high strength, high toughness and wear resistance parts.

Ggg50 Ductile Iron Castings By Country

1. Implementation standards: The company strictly implements ISO9001 & TS 16949 certification.

2. Product material standards: ISO, GB, ASTM, SAE, ISO, EN, DIN, JIS, BS

3. Main processes: sand casting, silica sol investment casting, water glass investment casting,shell casting,deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.

4. Available materials:

And alloy steel, gray iron, cast iron, cast steel, cast aluminum, cast copper, etc. can be customized according to customer requirements.

Chemical Composition

Carbon C: 3.70～4.00%

Silicon Si: 2.15～2.93%

Manganese Mn: 0.46～0.66%

Sulfur S: 0.010～0.016%

Phosphorus P: 0.027～0.035%

Magnesium Mg: 0.027～0.050%

Rare earth Re: 0.026～0.043%

Carbon equivalent: 4.3～4.6

Mechanical Properties

Tensile strength σb (MPa): ≥450

Conditional yield strength σ0.2 (MPa): ≥310

Elongation δ (%): ≥10

Hardness: 160～210HB

Microstructure

Heat Treatment Specifications: As-Cast or Normalized

Metallographic structure: as-cast: graphite + ferrite (matrix structure) + pearlite

Normalizing: graphite + more pearlite + ferrite, can obtain higher comprehensive mechanical properties, especially the improvement of plasticity and toughness.

Casting Technology Of Ggg50 Ductile Iron Castings

Casting process of ductile iron QT400-18 for wind power casting planet carrier. The large-scale wind power planetary carrier has the characteristics of large size, complex structure, and high mechanical performance requirements. It is prone to casting defects such as shrinkage porosity, blisters, and cracks during the casting process.

1. Overview of the planet carrier: φ1600×850, weight 4 tons, main wall thickness 100mm, ultrasonic flaw detection, no shrinkage porosity defects are allowed;

2. Casting process: the upper, middle and lower three boxes are modeled, the edge-pressing riser is set on the upper box, and an appropriate amount of cold iron is placed in other parts; resin sand modeling;

3. Melting process: using scrap steel carbonization process, pouring time 30 seconds, pouring temperature 1350-1320; holding time 3 days;

4. Trial production: There are shrinkage porosity defects in individual parts. After adjusting the position of the riser and chiller, there is no shrinkage porosity defect after trial production;

Of course, the above casting process of ductile iron QT400-18 for the planet carrier of wind power castings is just a brief introduction. The specific practice needs to be analyzed according to the specific situation. Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is a large-scale foundry manufacturer that produces wind power castings and high-speed iron castings. Welcome Purchasing from all over come to discuss the inquiry!

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam)

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control of High chromium sand cast iron: The defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.

5. The quality can be traced back.

Application

GGG50 Ductile Iron Castings have good plasticity and toughness, good weldability and machinability. For the production of agricultural machinery, ploughs, harvesters, lawn mowers, wheel hubs, drive shaft objects, clutch housings, differential housings, etc. Chassis, Gearbox.

The numerical simulation of the casting process of ductile iron uses numerical simulation techniques, including the filling process of the metal liquid, the cooling and solidification process, the stress formation process and the degree of influence of the main elements in the forming process.