High Hardness 17-7PH Stainless Steel Bar Round Bar Diameter 10 -
250mm Hot Rolled / Forged Bars
17-7 PH Stainless Steel Round Bars
17-7 PH (1.4568, UNS S17700) is an austenitic-martensitic
precipitation hardening stainless steel developed on the basis of
18-8CrNi, also known as controlled phase change stainless steel.
The characteristics of 17-7PH alloy are that it can be heat treated
to obtain high hardness and high strength, excellent fatigue
resistance, good corrosion resistance and small heat treatment
deformation.
17-7PH precipitation hardening steel This type of steel is mainly
used to manufacture aircraft shells, structural parts, missile
pressure vessels and components, jet engine parts, springs,
diaphragms, bellows, antennas, fasteners, measuring instruments,
etc.
Overview of 17-7 PH Stainless Steel:
17-7PH precipitation hardening stainless steel is a dispersion
hardening stainless steel with high strength, high hardness,
fatigue resistance, good corrosion resistance and forgeability, and
little deformation when exposed to high temperatures. This steel
has good properties and is especially suitable for aerospace In the
aviation field, this special alloy is also suitable for other
fields with high strength and corrosion resistance requirements.
When the temperature reaches 316℃, the spring performance is still
good. SUS631 is used in the aerospace, chemical, petrochemical,
paper and metal processing industries.
The 17-7PH stainless steel is an unstable austenite structure after
solid solution treatment, with good ductility and workability.
After adjustment, the austenite precipitates and carbides are
changed. After the martensite transformation treatment, most of the
The structure transforms into low-carbon tempered martensite with
better toughness. This state is the state of use of steel and has
good medium temperature mechanical properties. The corrosion
resistance of 17-7PH is better than that of general martensitic
stainless steel.
17-7PH supply specifications: round steel, bar, strip, pipe, valve
seat, sphere, flange and forging
Chemical Composition of 17-7PH stainless steel::
| Alloy | C | Mn | Si | P | S | Cr | Ni | Al |
| 17-7PH | ≤0.09 | ≤1 | ≤1 | ≤0.04 | ≤0.03 | 16～18 | 6.5～7.75 | 0.75～1.5 |
17-7PH Physical Properties:
Density
| 7.65g/cm3 |
| Melting point | 1415-1450℃ |
Mechanical properties of 17-7PH
| Alloy | Tensile strength Rm N/mm2 | Yield strengt RP0.2N/mm2 | Elongatio A5% | rinell hardnes HB |
| Solid melting 1000~1100℃ fast cooling | ≤1030 | ≤380 | ≥20 | ≤229 |
| Aging at 565℃ | ≥1140 | ≥960 | ≥5 | ≥363 |
| Aging at 510℃ | ≥1230 | ≥1030 | ≥4 | ≥388 |
Application:
17-7 PH (1.4564, UNS S17700) stainless steel is mainly used to
manufacture aircraft shells, structural parts, missile pressure
vessels and components, jet engine parts, springs, diaphragms,
bellows, antennas, fasteners, measuring instruments, etc.
