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DD ENV 1090 Part 6 is the new fabrication and erection specification for stainless steel. It covers austenitic and duplex stainless steels used in buildings and other similar steel structures.
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BS EN 10269 is the material standard for stainless and heat-resisting steels, a selection of low alloy steels and some nickel alloys for fasteners. The ambient temperature mechanical properties shown in this article include 0.2% proof strength, tensile strength, elongation, reduction in area and impact, (Charpy), strength in the finally heat treated condition. Specified hardness levels for the steels for subsequent quenching and tempering, (1.4923, 1.4938 and 1.4913), in their delivery condition are also included.
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Austenitic stainless steels have excellent resistance to corrosion by acetic acid emitted by wood. They are NHBC recommended for a range of fasteners and fixings in timber. For use in immersed timber, the choice of grade depends on the specific water conditions, including chloride level and flow rate. Careful grade selection is also required for fixings in timber in swimming pool buildings.
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The moisture level in timber is the most important factor in determining the incidence of corrosion. Above a threshold moisture level, wood is always acidic due to the breakdown of wood cellulose to acetic acid. Applied chemical treatments to the timber or exposure in a marine environment can increase the corrosion risk.
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BS EN 10269 is the material standard for stainless and heat-resisting steels, a selection of low alloy steels and some nickel alloys for fasteners. The chemical composition of stainless steel grades covered in the this standard include, 1.4307, 1.4301, 1.4303, 1.4404, 1.4401, 1.4429, 1.4567, 1.4923, 1.4938, 1.4913, 1.4982, 1.4910, 1.4919, 1.4941, 1.4980 and 1.4986
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This article compares the chemical composition of a number of 316 type grades as covered by the now superseded BS 1449 and BS 970 and their replacement, BS EN 10088 Parts 2 and 3. Grades covered include 316S11, 316S12, 316S13, 316S16, 316S31, 316S33 and European steel numbers 1.4401, 1.4404, 1.4432, and 1.4436
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BS EN 10269 is the material standard for stainless and heat-resisting steels, a selection of low alloy steels and some nickel alloys for fasteners. The elevated and sub-zero temperature mechanical properties shown in this article include 0.2% proof, tensile and impact, (Charpy), strengths.
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Galling, sometimes known as cold welding, is a form of severe adhesive wear which can occur when two metals are in relative motion and under sufficient load to permit the transfer of material. Severe galling can result in seizure of metal components. The key factors affecting the tendency for galling are design tolerances and the surface finish, hardness and microstructure of the metals in contact.
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Galling, sometimes known as cold welding, is a form of severe adhesive wear which can occur when two metals are in relative motion and under sufficient load to permit the transfer of material. Austenitic and precipitation hardening stainless steels have poor resistance to galling. Hardenable martensitic stainless steels have better galling resistance. The galling characteristics of duplex stainless steels is thought to be similar to that of austenitic stainless steels.
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Galling, sometimes known as cold welding, is a form of severe adhesive wear which can occur when two metals are in relative motion and under sufficient load to permit the transfer of material. Lubrication in improves galling resistance. A solid lubrication system such as a PTFE coating gives better galling resistance than greases. Altering the surface characteristics by nitriding or chromium plating also improves wear and galling resistance.
