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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.
Ambient temperature physical properties, including density, modulus of elasticity (Young’s modulus), coefficient of thermal expansion, thermal conductivity, specific heat (heat content or heat capacity) and electrical resistivity for a range of ferritic, martensitic, austenitic and duplex stainless steel types are tabulated. Some explanation of the units used for these properties is given.
This article describes the contents of the Architects’ Guide to Stainless Steel, an online resource containing an extensive amount of architectural information concerning stainless steel. The topics covered include grade selection, product forms, durability, economics, production and fabrication, surface finish, joining, maintenance and cleaning. The computer aided learning package Stainless SteelCAL is also described.
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.
The stiffness of a stainless steel component varies with the stress level, the stiffness decreasing as the stress level increases. Consequently deflections are greater in stainless steel beams than in carbon steel beams. This article explains how to calculate the deflection in a stainless steel beam. (206)
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.
This article compares the chemical composition of a number of 316 type grades as covered by the now superseded BS1449 and BS970 and their replacement, BS EN 10088 Parts 2 and 3.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
This article highlights the differences between designing structural components in carbon steel to those in stainless steel. The stress-strain behaviour and mechanical properties are compared and the implications on structural behaviour described. (205)
This article gives recommendations for full and partial penetration butt welds and fillet welds made by an arc welding process. The adequacy of a weld at ultimate limit state may be determined by the simple method of BS 5950:1. The Geometric parameters required for the calculation of design strength are the effective length of the weld and the effective throat size, whilst guidance is given on suitable range for the angle of intersection at the joint.
Issues relating to the design of stainless steel handrails and balustrades are discussed. Section availability and grade selection are also covered.