GGG60 Ductile Iron Castings

Product Description

GGG60 Ductile Iron Castings corresponds to the Chinese brand qt500-7, what does qt500-7 mean? It means that the compressive strength is 500MPA, and 7 means that the tensile strength is 85% ferrite. German grade GGG50, American grade 70-50-05, international standard 500-7. It is a metallographic ductile iron with a medium level of compressive strength and ductility. At lower temperatures, both corrosion and heat resistance are good, and its ductility is immediately converted to ductility. Mainly, the essence of ductile iron belongs to iron, but it also has the effect of steel, with excellent plasticity and corrosion resistance, and the in-situ stress in the production process is relatively complex, such as the oil pump gear of a gas turbine or the gate valve of a water turbine generator set. Can supply municipal works to sewage pipelines.

GGG60 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: 3.55~3.85

Silicon Si: 2.34~2.86

Manganese Mn: <0.6

Sulfur S: <0.025

Phosphorus P: <0.08

Magnesium Mg: 0.02~0.04

Rare earth content RE: 0.03~0.05

Mechanical Properties

Tensile strength σb (MPa): ≥500

Conditional yield strength σ0.2 (MPa): ≥320

Elongation δ (%): ≥7

Hardness: 170～230HB

The hardness of gb/t1348-2009 ductile iron castings is related to the grade. The specific data are as follows:

QT400-18: 130~180HBS

QT400-15: 130~180HBS

QT450-10: 160~210HBS

QT500-7: 170~230HBS

QT600-3: 190~270HBS

QT700-2: 225~305HBS

QT800-2: 245~335HBS

QT900-2: 280~360HBS

Casting Technology Of GGG60 Ductile Iron Castings

How to ensure that the attached casting test block of QT500-7 meets the requirements of the national standard?

Mortar test block evaluation standard

To evaluate the strength grade of the mortar test block, the test piece of standard curing 28d shall prevail. The test piece is a cube with a side length of 70.7 mm. The 6 test pieces are one group, and the number of groups should meet the following requirements:

1. The mortar test blocks with different strength grades and different mixing ratios should be prepared separately, and the test specimens should be randomly prepared and cannot be selected.

2. For important and main masonry buildings, 2 groups are prepared for each work shift. For general and secondary masonry buildings, one group can be prepared for each work class.

3. The arch ring mortar test block should be prepared at the same time as the masonry under the same conditions to check the strength of each construction stage.

According to "Code for Design of Masonry Structure" and "Code for Masonry Engineering and Acceptance", the strength grade of mortar test block is 70.7mm × 70.7mm × 70.7mm test piece, which is subjected to 20C±3C and humidity of 60%～80%. The arithmetic mean of the compressive strength of 6 specimens after curing for 28 days was determined. Mortar is divided into 6 grades: M20, M15, M10, M7.5, M5, and M2.5. The mixed mortar test block should meet the design requirements of the type and strength grade, and meet the requirements of the specified consistency, good water retention and uniform mixing. The strength grade of the mortar test block used for the walls and columns that are subjected to vibration and the height exceeds 6M should not be less than M2.5. The strength level of mortar test blocks in severe cold areas and in humid environments below the ground is generally increased by one level.

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.

Mortar Test Block Size

The size of the mortar test block is generally fixed, mainly a cube with a side length of 70.7mm. According to the standard conditions, the compressive strength value is determined by curing to 28d under the conditions of (20±2)℃ temperature and relative humidity above 90%. Mortar strength grade.

Application

When GGG60 Ductile Iron Castings is low temperature, the toughness changes to brittleness, but the low temperature impact value is higher, and it has certain resistance to temperature abrupt change and corrosion resistance. It is widely used in oil pump gears of internal combustion engines, medium temperature cylinder diaphragms of steam turbines, valve bodies of hydraulic turbines, bearing bushes of railway rolling stock, drive shafts of machine bases, etc.