Aceroinoxidable----Grade D7 Tool Steel (UNS T30407)
Introduction
The AISI grades of alloy steels area unit the foremost common scale wont to establish varied grades of tool steel. the upper carbon grade tool steels area unit usually used for applications like stamping moud, metal cutting tools, etc.
AISI D7 alloy steel could be a high-carbon, high-chromium air-hardening alloy steel that exhibits exceptional wear resistance, with supplemental carbon and metallic element.
The data below can give an summary of grade D7 tool steels.
Chemical Composition
The chemical composition of D7 tool steels is made public within the following table.
|
Element |
Content (%) |
|
Iron, Fe |
79.3 |
|
Chromium, Cr |
12.5 |
|
Vanadium, V |
4 |
|
Carbon, C |
2.3 |
|
Molybdenum, Mo |
1.1 |
|
Silicon, Si |
0.4 |
|
Manganese, Mn |
0.4 |
Physical Properties
The following table shows the Machinical properties of D7 tool steels.
|
Properties |
Metric |
Imperial |
|
Density |
7.7-8.03 g/cm3 |
0.278 – 0.290 lb/in3 |
Mechanical Properties
The mechanical properties of D7 tool steels area unit displayed within the following table
|
Properties |
Metric |
Imperial |
|
Modulus of elasticity |
190-210 GPa |
27557-30458 ksi |
|
Poisson’s ratio |
0.27-0.30 |
0.27-0.30 |
|
Hardness, Rockwell C |
62.5 |
62.5 |
|
Izod impact unnotched |
21.7 J |
16 ft.lb |
D7 alloy steel is slowly heated at 1093 - 1149°C (2050 - 2100°F). The forgings area unit then cooled slowly in dry sand or in different insulating media. D7 alloy steel is heated at 871 - 899°C (1600 -1650°F) for two hours and cooled to 538°C (1000°F). To release machining stresses, A11 tool steels area unit heated to a temperature of 621 - 677°C (1150 - 1300°F) so slowly cooled in still air. D7 alloy steel is hardened at (1900-2000°F) and slowly cooled in air. Tempering of D7 alloy steel is applied at (400-1000°F) for one h. The following area unit the list of applications of D7 tool steels: Key Words: Stainless Steel Plates, Stainless Sheet 304, aceroinoxidable
Fabrication and warmth treatment
Forging
Annealing
Stress Relieving
Hardening
Tempering
Applications
Brick mould liners, Powder compaction tooling, Shot blasting instrumentation liners, Flattening rolls, Powder compaction tooling, Tools for ceramic extrusion and molding.