Stocked Material Grades
*304 (1.4301)/ *304L (1.4306)/303(1.4305)/321(1.4541)/*316(1.4401)/* 316L (1.4404)
Austenitic Stainless Steels, these are alloys containing chromium and nickel, structured around a composition of iron, 18% chromium, and 8% nickel. Variants contain additions of Carbon and/or Molybdenum and/or Titanium and/or Sulphur to alter the structure and properties. Austenitic steels are not hardenable by heat treatment only by cold work. The most familiar stainless steels are probably Type 303/304/316. All have excellent corrosion resistance.
Martensitic stainless steels are low carbon steels built around the Type 410 composition of iron, 12% to 15% Chromium, and 0.08% to 0.50% % Carbon. They are usually hardened and tempered to give varying tensile properties. Tempered martensite gives steel good hardness and high toughness. Untempered martensite is low in toughness and therefore brittle. Type 431 has the addition of Ni to further improve the properties. These steel have a poor corrosion resistance compared to austenitics.
440C/440B, are a high carbon martensitic stainless with moderate corrosion resistance, good strength and the ability to obtain and hold excellent hardness (Rc 50 to 60) and wear resistance. They are considered to be slightly cold workable by common practices and do respond well to heat treatment.
*F51 Duplex UNS31803/1.4462
Duplex Stainless Steel contain 22% chromium which give an austenitic/ferritic structured steel with moderate/good strength and good general corrosion/ stress corrosion cracking resistance. This grade is used in Oil & Gas, brewing, power generation and chemical industry applications.
*ASTM A564 Type 630 (17/4PH) In Condition A, H900, H1025, H1075 and H1150D
This is a Precipitation Hardening Stainless Steel Bar which can be aged at varying temperatures to give varying degrees of mechanical strengths. This grade exhibits high strength/toughness with a moderate/good corrosion resistance and high fatigue resistance. Used in aerospace equipment and missile components and is a commercial grade used in oil and gas industries.
FV520B In the conditions Primary Hardened and 750/550 Aged
This is a Precipitation Hardening Stainless Steel that exhibits high strength with moderate/good corrosion resistance. This grade can have varying heat treatments which can be to give differing degrees of mechanical strength. The grade exhibits a high impact resistance in the 550 Deg C ‘aged’ condition. This grade is used in mechanical components in aerospace and defence, valves and pumps.
EN 10088-3 - 1.4418, QT 900
This is a high strength low carbon martensitic/austenitic stainless steel. It combines high strength with good weldability - properties, which aremaintained after welding. This grade is designed for applications in slightly corrosive environments where above mentioned properties are required. In our stock standard condition the steel matrix consists of 80 % martensite, 10 % austenite and 10 % ferrite. This composition allows a low carbon martensitic structure after quenching and tempering. Martensite, some remaining austenite, chrome and molybdenum together contribute to the following characteristic properties.
- High tensile strength
- High toughness - also in welds
- Better corrosion properties than for most of the existing stainless martensitic steels
- Very good fatigue resistance
* Materials where applicable are supplied in accordance with NACE MR-01-75