MP35N: Premium NACE‑MR0175 Grade for Corrosion‑Resistant Applications

MP35N™ is a trademarked grade produced by Latrobe Speciality Steel, a subsidiary of Carpenter Technology in the USA, and the trademark is owned by SPS Technologies Inc. This data sheet covers material produced for optimum corrosion resistance and to comply with the requirements of NACE MR0175. It has a face centred cubic structure matrix of cobalt and nickel, in which chromium and molybdenum are soluble at elevated temperatures. The fcc structure persists upon cooling to room temperature and below. Thereafter the combination of cold work and ageing temperature determines that the maximum CRA properties are achieved.

Properties

General

Property	Temperature	Value	Comment
Density	23.0 °C	8.43 g/cm³
Grain size		4 μm	Maximum, ASTM E112

Dimension

Property	Value
Length	12.7 - 76.2 mm

Mechanical

Property	Temperature	Value	Comment
Elongation	23.0 °C	10 %	ASTM E8, For 50.8mm diameter
Hardness, Rockwell C	23.0 °C	51 [-]
Reduction of area	23.0 °C	40 %	ASTM E8, For 50.8mm diameter
Shear strength	23.0 °C	1034 MPa	For 25.4mm diameter
Tensile strength	23.0 °C	190 - 220 MPa	ASTM E8, Depending on the aging, for 50.8mm diameter
Yield strength Rp0.2	23.0 °C	180 - 210 MPa	ASTM E8, Depending on the aging, for 50.8mm diameter

Chemical properties

Property	Value
Boron	0.15 %
Carbon	0.025 %
Chromium	19 - 21 %
Cobalt	Balance
Iron	1 %
Manganese	0.15 %
Molybdenum	9 - 10.5 %
Nickel	33 - 37 %
Phosphorus	0.02 %
Silicon	0.15 %
Sulfur	0.01 %
Titanium	1 %

Technological properties

Property
Application areas	NACE material is ideally suited for oil field equipment such as fasteners, springs, non-magnetic electrical components, instrument parts, valve components, high pressure door fittings, actuators, seals, shafts and other components.
Corrosion properties	MP35N in its NACE variant offers exceptional stress corrosion cracking (SCC) resistance for harsh environments such as hydrogen sulphide, salt water and other chloride environments, as well as resists attack from mineral acids (nitric, hydrochloric and sulphur). The material has exceptional resistance to crevice and stress corrosion cracking in sea water and other hostile environments.
Processing methods	Melting: MP35N™ is produced by vacuum induction melting followed by VAC-ARC remelting to provide exceptional control of chemistry and ingot solidification.

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Metal