Contact BSSA

Category: Engineering Components

  1. Causes of metal corrosion in timber fixings

    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.

  2. Hardness test methods and hardness conversion tables

    Hardness testing methods, including Brinell, Vickers and Rockwell are outlined. The hardness scales, including HB HV HRB and HRC are shown for each method and a comparison table of hardness values between these scales presented.

  3. Heat treatment of stainless steels for spring applications

    Heat treatment (tempering) of austenitic strip and wire grades for enhanced mechanical properties is referenced in BSEN 10151 (strip) and BSEN 10270-3 (wire).

  4. Restriction of hazardous substances (RoHS) and 'waste electrical and electronic equipment' (WEEE) directives on the lead, mercury, cadmium and hexavalent chromium content of stainless steels

    The original version of European directive 2002/95/EC effectively out-lawed stainless steels and many other materials as no lead, mercury, cadmium, hexavalent chromium, poly-brominated biphenyls (PBB) or polybrominated diphenyl ethers (PBDE) content was to be allowed in materials that would be part of equipment 'which is dependant on electric current in order to work properly'. This has now been rectified in the Official Journal of the European Union document C(2005) 3143, 2005/618/EC, published on 18th August 2005, allows maximum levels of 0.1% for all these, except cadmium which is 0.01%, which is the same as in the ELV directive. In stainless steels only the restrictions to the elements lead, mercury and cadmium are relevant. Commercially produced stainless steels can be expected to comply with the amended RoHS requirements, without actual values being measured or declared by the steelmaker or supplier.

  5. Specifying stainless steel for spring applications

    BSEN 10151 (strip) and BSEN 10272-3 (wire) for springs are outlined. The grades in each standard are tabulated and compared to the BS5770-4 and BS2056 which they replace, where grades such as 301S21 301S81 302S26 302S25 and 305S11 were specified. Grades listed include 1.4016 1.4021 1.4028 1.4031 1.4568 (17/7 PH type) 1.4310 1.4301 1.4401 1.4369 1.4372 and 1.4568 Mechanical properties in the cold worked (temper rolled for strip, drawn for wire) conditions are shown. Heat treated properties for precipitation hardening grade 1.4568 wire are also shown.

top

Office and Postal Address: BSSA, Regus, Blades Enterprise Centre, John Street, Sheffield S2 4SW

Registered Office: Pegasus House, 463A Glossop Road, Sheffield S10 2QD

Tel: +44 (0)114 292 2636    |     Email: admin@bssa.org.uk

Copyright © 2017 British Stainless Steel Association

web design sheffield by Llama Digital