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"Forging" of forged steel is the process of making a material that changes shape and inner structure without melting it. In the process of punching and forging, the grain structure inside the metal is deformed, meanwhile, the grain deformation process spreads over the whole metal part, and the forged part can be shape into the designed shape. The difference between forged steel and cast steel is mainly reflected in the different processing technology (forging and casting) of the steel, forging is a plastic deformation process, while casting is liquid molding.
The design of wrought steel and the grinding tools for its production require initial cost. However, the cost of each part is low, so the cost of large volume steel parts can be reduced.
The table below shows general forging material of forged steel valves, as well as the working condition of the material.
MATERIAL | SPECIFICATION | MEDIA | TEMP. | TEMP. |
A105N | ASTM A105N | Non-corrosive | -20～800 | -46～427 |
LF2 | ASTM A350 LF2 | Non-corrosive | -20～1200 | -30～650 |
F5 | ASTM A182 F5 | Non-corrosive | -20～1200 | -30～650 |
F9 | ASTM A182 F9 | Non-corrosive | -20～1200 | -30～650 |
F11 | ASTM A182 F11 | Non-corrosive | -20～1100 | -30～593 |
F22 | ASTM A182 F22 | Non-corrosive | -20～1100 | -30～593 |
F91 | ASTM A182 F91 | Non-corrosive | -20～1200 | -30～650 |
304 | ASTM A182 F304 | Corrosion | ≤ 1000 | ≤ 538 |
304L | ASTM A182 F304L | Corrosion | ≤ 800 | ≤ 427 |
304H | ASTM A182 F304H | Corrosion | ≤ 800 | ≤ 427 |
316 | ASTM A182 F316 | Corrosion | ≤ 1000 | ≤ 538 |
316L | ASTM A182 F316L | Corrosion | ≤ 800 | ≤ 427 |
316H | ASTM A182 F316H | Corrosion | ≤ 800 | ≤ 427 |
317L | ASTM A182 F317L | Corrosion | 1700～2200 | 927～1204 |
321 | ASTM A182 F321 | Corrosion | ≤ 800 | ≤ 427 |
347 | ASTM A182 F347 | Corrosion | 800～1650 | 427～899 |
410 | ASTM A182 F6a | Corrosion | ≤ 1200 | ≤ 649 |
420 | ASTM A276 420 | Corrosion | ≤ 800 | ≤ 427 |
17-4PH | ASTM A564 630 | Corrosion | ≤ 600 | ≤ 316 |
440C | ASTM A276 440C | Corrosion | ≤ 800 | ≤ 427 |
ALLOY 20 | ASTM A182 F20 | Corrosion | ≤ 800 | ≤ 427 |
F51(DUPLEX2205) | ASTM A182 F51 | Corrosion | ≤ 600 | ≤ 316 |
F53(DUPLEX 2507) | ASTM A182 F53 | Corrosion | ≤ 600 | ≤ 316 |
F55 | ASTM A182 F55 | Corrosion | ≤ 600 | ≤ 316 |
400 | ASTM B564 400 | Corrosion | ≤ 1000 | ≤ 538 |
K500 | QQ-N-286 K500 | Corrosion | ≤ 896 | ≤ 480 |
600 | ASTM B564 600 | Oxidation | ≤ 2000 | ≤ 1093 |
625 | ASTM B564 625 | Oxidation | ≤ 2000 | ≤ 1093 |
800H/HT | ASTM B564 800 | Oxidation | ≤ 1100 | ≤ 593 |
825 | ASTM B564 825 | Corrosion | ≤ 1000 | ≤ 538 |
X-750 | ASTM B637 X-750 | Corrosion | ≤ 1300 | ≤ 700 |