General Properties Grade 430 is a ferritic, straight chromium, non-hardenable grade, combining good corrosion resistance and formability characteristics with useful mechanical properties. Its ability to resist nitric acid attack permits its use in specific chemical applications but automotive trim and appliance components represents its largest fields of application. Grade 430F is the free-machining version of this grade, available in bar form for use in automatic screw machines. Grade 434 is the molybdenum bearing version of Grade 430 and has the same useful combination of properties. Its molybdenum addition improves corrosion resistance. These properties for 430 are specified for flat rolled product (plate, sheet and coil) in ASTM A240/A240M. Similar but not necessarily identical properties are specified for other products such as forgings and bar in their respective specifications. Properties of Grade 430F are specified for bar in ASTM A582. STANDARDS INDUSTEEL TRADEMARKS UNS ASTM EURONORMS EN SUS B4 S43000 430 1.4016 SUS 430 Composition Grade C Mn Si P S Cr Mo Ni N 430 min. max. - 0.12 - 1.00 - 1.00 - 0.040 - 0.030 16.0 18.0 - - 0.75 - 430F min. max. - 0.12 - 1.25 - 1.00 - 0.06 0.15 - 16.0 18.0 - - - Mechanical Properties Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof (MPa) min Elongation (% in 50mm) min Hardness Rockwell B (HR B) max Brinell (HB) max 430 450 205 22 89 183 430F 552 typical 379 typical 25 typical - 262 Physical Properties Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (mm/m/°C) Thermal Conductivity (W/m.K) Specific Heat 0-100°C (J/kg.K) Electrical Resistivity (nW.m) 0-100°C 0-315°C 0-538°C at 100°C at 500°C 430 7750 200 10.4 11.0 11.4 23.9 26.0 460 600 430F 7750 200 10.4 11.0 11.4 26.1 26.3 460 600 Possible Alternative Grades In the table below are a list of possible alternative grades to Grade 430. Grade Reason it  may be chosen instead of 430 430F Higher machinability than 430 is needed in bar product, and reduced corrosion resistance is acceptable. 434 Better pitting resistance is required 304 Slightly higher corrosion resistance is needed, together with greatly improved ability to be welded and cold formed 316 Much better corrosion resistance is needed, together with greatly improved ability to be welded and cold formed 3CR12 A lower corrosion resistance is acceptable in a cost-critical application Corrosion Resistance Grade 430 has good resistance to a wide variety of corrosive enviornments, including nitric acid and some organic acids. It attains its maximum corrosion resistance when in the highly polished or buffed condition. In general its resistance to pitting and crevice corrosion resistance is close to that of grade 304. Stress corrosion cracking resistance of Grade 430 is very high, as it is for all ferritic grades. Like other high-sulphur free machining grades 430F has much reduced resistance to pitting and crevice corrosion compared to its non-free machining equivalent. Heat Resistance Grade 430 resists oxidation in intermittent service up to 870°C and to 815°C in continuous service. This grade may become brittle at room temperature after prolonged heating in the 400-600°C range. This effect can be eliminated by annealing. Heat Treatment 1、Solution Annealing – Heat to 815-845°C, hold for ½ hour per 25mm of thickness, slow furnace cool to 600°C and then quickly air cool. Slow cooling from 540-400°C will cause embrittlement. 2、Sub-Critical anneal – Heat to 760-815°C and then air cool or water quench. 3、This grade is not hardenable by thermal treatment. Welding 1、Pre-heat at 150-200°C if welding is necessary. 2、Embrittlement in the weld metal and heat affected zone can be relieved by a post-weld anneal at 790-815°C 3、Grain refinement will not occur. Machining 1、Easier to machine than the standard austenitic grades such as 304. 2、Still a tendency for galling and pick-up on the cutting tool. 3、Bars that have been lightly drawn are easier to machine than those in the annealed condition. 4、Grade 430F, the free machining version of 430, is very much easier to machine. Fabrication 1、Lower work hardening rate makes bending and forming somewhat easier than for grade 304 2、Lower ductility restricts very severe operations. 3、Severe bends should be made with the bend axis at right angles to the rolling direction. 4、Severe cold heading of 430 wire is possible.