17-4 ph round bar sheets plates dubai

17-4 PH Stainless Steel Round Bars, 17-4 PH Stainless Steel Sheets, 17-4 PH Pump Shafts

Al Qarib Trading LLC, is the first and best choice for special material supplies. We are regularly supplying  17-4 PH Stainless Steel Sheets Plates Round bars for critical project requirements for various industries in the U.A.E. In the past we have supplied same grade material in shaft tolerance as well machining to clients application requirements. We are supplying these special grade material from reputed mills in Europe, U.K. and U.S.A.


Precipitation hardening stainless steels are chromium and nickel containing steels that provide an optimum combination of the properties of martensitic and austenitic grades. 17-4 PH Stainless Steel is a precipitation hardening martensitic stainless steel. Typical usage is for applications requiring high strength and a modest level of corrosion resistance. Desired strength and toughness can be manipulated by temperate range in the heat treatment process. Hardening is achieved through the addition of one or more of the elements Copper, Aluminium, Titanium, Niobium, and Molybdenum.

The most popular precipitation hardening steel is 17-4 PH. Its name comes from the additions 17% Chromium and 4% Nickel. It also contains 4% Copper and 0.3% Niobium. 17-4 PH is also known as stainless steel grade 630.

There are many advantages of precipitation hardening steels and one is that they can be supplied in a “solution treated” condition, which is readily machinable. After machining or another fabrication method, a single, low temperature heat treatment can be applied to increase the strength of the steel. This is known as ageing or age-hardening. As it is carried out at low temperature, the component undergoes no distortion. In addition to limiting the hardness, NACE MR0175 restricts the age hardening cycles that can be applied to the alloy to two of the several available. NACE MR0175 only permits solution treatment, followed by double aging to either the H1150M condition 760°C (1400°F) / 620°C (1150°F) or the DH1150 condition 620°C (1150 °F) / 620°C (1150°F).


Precipitation hardening steels are classified into one of three groups based on their final microstructures after heat treatment. The three types are: martensitic (e.g. 17-4 PH), semi-austenitic (e.g. 17-7 PH) and austenitic (e.g. A-286).

Martensitic Alloys

Martensitic precipitation hardening stainless steels predominantly show  austenitic structure at annealing temperatures of around 1040 to 1065°C. Upon cooling to room temperature, they undergo a transformation that changes the austenite to martensite.

Semi-austenitic Alloys

Unlike martensitic precipitation hardening steels, annealed semi-austenitic precipitation hardening steels are soft enough to be cold worked. Semi-austenitc steels retain their austenitic structure at room temperature but will form martensite at very low temperatures.

Austenitic Alloys

Austenitic precipitation hardening steels retain their austenitic structure after annealing and hardening by ageing. At the annealing temperature of 1095 to 1120°C the precipitation hardening phase is soluble. It remains in solution during rapid cooling. When reheated to 650 to 760°C, precipitation occurs. This increases the hardness and strength of the material. Hardness remains lower than that for martensitic or semi-austenitic precipitation hardening steels. Austenitic alloys remain nonmagnetic.


Yield strengths for precipitation-hardening stainless steels are 515 to 1415 MPa. Tensile Strengths range from 860 to 1520 MPa. Elongations are 1 to 25%. Cold working before ageing can be used to facilitate even higher strengths.

Chemical Composition

Spec: EN 10088-3:2005

1.4542 Steel

Chemical Element % Present

Carbon (C) 0.0 – 0.07

Chromium (Cr) 15.00 – 17.00

Manganese (Mn) 0.0 – 1.50

Silicon (Si) 0.0 – 0.70

Phosphorous (P) 0.0 – 0.04

Sulphur (S) 0.0 – 0.03

Nickel (Ni) 3.00 – 5.00

Copper (Cu) 3.00 – 5.00

Molybdenum (Mo) 0.0 – 0.60

Niobium (Columbium) (Nb) 0.0 – 0.45

Iron (Fe) Balance


Physical Property Value

Density 7.75 g/cm³

Thermal Expansion 10.8 x10^-6 /K

Modulus of Elasticity 196 GPa

Thermal Conductivity 18.4 W/m.K

Electrical Resistivity 0.8 x10^-6 Ω .m

Spec: EN 10088-3:2005

Bar – Solution Annealed – Up to 100mm Dia. / Thickness

Mechanical Property Value

Tensile Strength 1200 Max MPa

Hardness Brinell 360 Max HB

Spec: EN 10088-3:2005

Bar – at P800 – Up to 100mm Dia / Thickness

Mechanical Property Value

Proof Stress 520 Min MPa

Tensile Strength 800 – 950 MPa

Elongation A 18Min %

Spec: EN 10088-3:2005

Bar – at P930 – Up to 100mm Dia. / Thickness

Mechanical Property Value

Proof Stress 720 Min MPa

Tensile Strength 930 – 1100 MPa

Elongation A 16 Min %

Spec: EN 10088-3:2005

Bar – at P960 – Up to 100mm Dia. / Thickness

Mechanical Property Value

Proof Stress 790 Min MPa

Tensile Strength 960 – 1160 MPa

Elongation A 12 Min %

Spec: EN 10088-3:2005

Bar – at P1070 – Up to 100mm Dia. / Thickness

Mechanical Property Value

Proof Stress 1000 Min MPa

Tensile Strength 1070 – 1270 MPa

Elongation A 10 Min %

Typical Applications

• Pump Shafts

• Oil and petroleum refining equipment

• Mechanical Seals

• Aerospace