Service

Quality Assurance

We at MGFPL, prioritize quality throughout our manufacturing processes, by following stringent quality control procedures. We conduct metallurgical analysis vide our duly calibrated PMI Machine, and then send it to reputed NABL Laboratories for full Chemical Testing. Dimensional accuracy is maintained by precise measurements and dimensional checks, with timely calibrated instruments , at multiple stages to ensure that castings meet the required specifications.

THE FOLLOWING DIES FOR MANUFACTURING
CENTRIFUGAL CASTINGS ARE AVAILABLE WITH US

DIE SIZE
1231 X 625 L	1571 X 625 L	2071 X 625L	2571 X 625 L	3011 X 625 L
1271 X 625 L	1661 X 625 L	2221 X 625 L	2681 X 625 L	3211 X 660 L
1391 X 625 L	1811 X 625 L	2411 X 625 L	2781 X 625 L	3321 X 382 L
1461 X 625 L	1961 X 625 L	2481 X 625 L	2911 X 625 L

Generally

Annealing and solution annealing are common for austenitic and duplex steels to relieve stresses and enhance corrosion resistance.

Hardening and tempering are primarily used for martensitic steels to increase strength and wear resistance.

Age hardening (precipitation hardening) is used for PH stainless steels to enhance strength while maintaining good corrosion resistance.

By selecting the right heat treatment process, we can optimize performance and durability for any specific industrial application

Impact of Heat Treatment on Common
ASTM Stainless Steel Grades

ASTM Grade	Heat Treatment Process	Effect on Properties	Applications
304 / 316	Annealing or Solution Annealing	Improves formability and restores corrosion resistance.	Chemical processing, food processing, marine
410	Hardening + Tempering	Increases hardness and wear resistance, with some loss of ductility.	Cutlery, turbine blades, pumps
420	Hardening + Tempering	Provides excellent wear resistance and corrosion resistance at moderate temperatures.	Valves, medical instruments
S31803 / S32750 (Duplex)	Solution Annealing	Increases strength and corrosion resistance, stabilizes ferritic phase.	Offshore platforms, heat exchangers, chemical processing
S32760 (Super Duplex)	Solution Annealing	Maximizes strength, corrosion resistance, and stress corrosion cracking resistance.	Marine, oil & gas, chemical processing
17-4PH	Age Hardening	Increases strength and hardness while maintaining good corrosion resistance.	Aerospace, valves, pumps

1. What is Hardness?

Hardness refers to the ability of a material to resist localized plastic deformation, typically by indentation. This characteristic is important in determining the wear resistance and strength of materials, especially metals, alloys, and polymers.

In hardness testing, a specified force is applied to a hard indenter (which could be made of diamond, steel, or carbide) that penetrates the surface of the material. The extent of the penetration or indentation is then measured and used to quantify the hardness.

2. Types of Hardness Tests

There are several standard methods used for hardness testing, and they differ in the type of indenter used, the method of applying force, and the way the hardness value is determined.

2.1. Brinell Hardness Test (BHN)

• Principle: This is a macro-hardness test that measures the diameter of an indentation left by a hard steel ball (or tungsten carbide ball) pressed into the material's surface under a specific load.
• Applications:
• Typically used for materials with coarse or irregular surfaces, like castings and forged parts.
• Common in industries where the material is subjected to high compression and impact.

2.2. Rockwell Hardness Test (HR)

• Principle: The Rockwell test measures the depth of penetration of a diamond cone or steel ball into the material's surface under a specific load. The test is fast and direct, with the hardness value being given immediately on a digital or analog scale.
• Applications:
• Widely used in manufacturing for metal parts and heat-treated steel.
• Suitable for harder materials with fine finishes.

2.3. Vickers Hardness Test (HV)

• Principle: This is a micro-hardness test that uses a diamond pyramid indenter (with an included angle of 136°) to measure the indentation made on the surface of a material under a known load.
• Applications:
• Microhardness testing for thin materials, coatings, and small parts.
• Used for coatings, metallography, and very precise materials where the exact indent size needs to be measured.

2.4. Knoop Hardness Test (HK)

• Principle: This is another micro-hardness test similar to the Vickers test but uses a rhombohedral diamond pyramid indenter with an elongated shape, which is more suitable for very thin or brittle materials.
• Applications:
• Used for thin sheets, microcomponents, coatings, and brittle materials like ceramics or harder metals.

2.5. Shore Hardness Test (Durometer)

• Principle: The Shore hardness test measures the depth of penetration of a spring-loaded indenter into the surface of the material. It is typically used for elastomers and plastics.
• Applications:
• Commonly used for testing rubber, plastics, and other non-metallic materials.
• Used in the automotive, medical, and manufacturing industries.

3. Factors Affecting Hardness Testing

Several factors can influence the results of hardness testing, including:

• Surface finish: The smoothness or roughness of the material’s surface can affect the test results, especially in methods like Brinell and Rockwell.
• Test Load: Different hardness tests use different load values, and the load can affect the size of the indentation.
• Temperature: High or low temperatures can affect the hardness of materials, as they can change their microstructure.
• Test Method: Each hardness testing method (Brinell, Rockwell, Vickers) gives different values and is suited for different material types.

4. Hardness Testing Applications

• Quality Control: Ensures the material meets specific strength and wear resistance requirements for tools, machinery, and structural components.
• Material Selection: Helps engineers choose materials with suitable hardness for their intended application (e.g., high-hardness steels for cutting tools or wear parts).
• Heat Treatment Validation: Verifies that the material has undergone the correct heat treatment to achieve the desired mechanical properties.