AS 1085.21-2014 pdf free download

AS 1085.21-2014 pdf free download.Railway track material Part 21 : Turnouts switches and crossIngs.
4.3 CAsTINGS
All castings shall be clean and smooth on the surface, free from blow holes, blisters or flaws of any kind, run full and sharp to the form and dimensions shown on the drawings and neatly dressed and cleaned. Machined steel shall he smooth on the surface and sharp to the form and dimensions shown on the drawings. All castings shall be machined to accurately fit the rails and shall comply with the following Standards:
(a) AS 1830 for cast iron.
(b) AS 1831 forductile iron.
(c) AS 2074 for cast steel.
4.4 NIANGANFSE STFFL CASTIN;S
4.4.1 General
All manganese steel castings, including RBM crossing inserts, solid cast crossings. manganese steel switch tips and any special compOnent part used for turnouts, switches and crossings shall conform to the provisions of this Clause (4.4).
All castings shall be clean and smooth on the surface, free from blow holes, blisters or flaws of any kind, run full and sharp to the form and dimensions shown on the drawings and neatly dressed and cleaned. Machined steel shall he smooth on the surface and sharp to the form and dimensions shown on the drawings. All castings shall be machined to accurately fit the rails.
The casting shall be manufactured so as to conform to the tolerances listed in Table 4.5.
4.4.2 Material
Cast manganese steel shall be in accordance with AS 2074 minimum Grade HIA.
4.4.3 Heat treatment
heat treatment shall be in accordance with AS 2074 minimum (irade HIA.
4.4.4 MachinIng allowance
A machining allowance may be specified, this is designed to remove surface defects from the critical regions of the casting and to reduce the amount of weld repairs performed. The machining allowance shall he removed by a metal cutting process.
4.4.5 Surface hardening
Unless indicated otherwise manganese steel crossings shall be explosively hardened to have hardness within the range 350 to 415 HBW.AS 1085.21-2014 pdf free download.