3C1 steel datasheet -
Transcript of 3C1 steel datasheet -
1
ENGINEERING TRIPOS, PART IIA
MANUFACTURING ENGINEERING TRIPOS, PART IIA
MODULE 3C1: MATERIALS PROCESSING AND DESIGN
MODULE 3P1: MATERIALS INTO PRODUCTS
DATASHEET FOR HEAT TREATMENT OF STEELS
Classification and Uses of Ferrous Alloys
UK Steel Designations
Equivalent Diameters for standard component shapes
CCT Diagrams for selected steels
H.R. Shercliff October 2012
2
Classification and Uses of Ferrous Alloys
Class Applications Main reasons for Typical heat y KIC Cost
alloying treatments (MPa) (MPam) (£/kg) (1999)
Low carbon Structural use (ships, Low C for modest, Normalised 250-400 40-80 0.25-0.45 steels buildings, bridges), strength, high toughness (< 0.3% C) automotive sheet, cans and ductility
Medium Shafts, gears, Medium C for good Normalised 300-1750 30-65 0.25-0.45 carbon steels forgings, tools strength, hardenability Quenched/ (0.3-0.7% C) and toughness tempered
High carbon Springs, dies, tools, High C for high Quenched/ 330-1120 25-50 0.25-0.45 steels railway track hardness, but toughness tempered (0.7-1.7% C) low
Cast irons Castings: lathe beds, High C for low Tm Normalised; 65-800 9-55 0.1-0.55 (2-4% C) engine blocks, steam and good castability some quenched/ turbine housings, vices tempered
Low alloy High strength use Alloyed for good Normalised 250-2250 15-210 0.25-0.65 steels (pipes, automotive strength, toughness, Quenched/ (0.2% C, up sheet, performance and hardenability tempered to 5% Ni, Cr, bicycles) Mo, V, Ti, Nb)
High alloy Cutting tools, dies Very high strength Quenched/ 700-2800 15-40 1-10 tool steels (retained at high T) tempered (0.7% C, and hardenability 18% W, 1% V, 4% Cr) High alloy High temperature and Cr for corrosion Normalised 180-2100 12-250 0.9-6 stainless steels chemical plant (pipes, resistance; Ni to stabilise (< 0.1% C, pressure vessels), fcc austenite. Good 18% Cr, cutlery, surgical strength, with high 8% Ni) instruments, toughness cryogenic vessels
3
UK Steel designations
There is no internationally agreed system for classifying steels - the current UK system is detailed in British Standard BS970, using 6 digit codes (e.g. 080M40, 304S12). The first 3 numbers relate to the class of steel: 000-199 C steels, C-Mn steels (the figures give the mean Mn content, from 0-1.99%) 200-240 Free machining steels (2nd and 3rd figures indicate sulphur content, from 0-0.4%) 250 Spring steels (Si-Mn steels) 300-499 Stainless, Heat-resisting and Valve steels 500-999 Alloy steels (subdivided by main alloy types, e.g. Ni-Cr, Ni-Cr-Mo etc) The character refers to the supply conditions, or indicates stainless steel: A chemical composition only H hardenability requirements given M mechanical requirements given S stainless steel The last 2 numbers give the mean carbon content, for A, H and M steels (from 0-0.99%). Example: 080M40 = 0.8%Mn, 0.4% carbon steel with specified composition and properties Many product forms are also covered by British Standards, e.g. steel sheet, forgings, reinforcing bar etc. The national steel trade association, UK Steel, maintains a data handbook for all steels available in the UK (over 1000 specifications). This has recently been made available on CD with a full list of suppliers and a search engine.
6
Correlation between bar diameter (oil-quenched) and distance along Jominy bar which have equivalent cooling rates