TGK SPECIAL STEEL PVT. LTD.

COLD WORKING TOOL STEEL TG S7 (DIN-1.2357) Chisels, rivet sets, punches, driver bolts. Hot punching and shearing. APPLICATIONS DESCRIPTION S7 is a general purpose air hardening tool steel having high impact and sock resistance. it has good resistance to softening at moderately high temperatures. This combination of properties makes it suitable for many hot-work and cold-work applications. 3 (average values) at ambient temperature : Density [gcm ] : 7.86 PHYSICAL PROPERTIES EQUIVALENT GRADES RAVNE OH253 MAT. NO. 1.2357 DIN 50CrMoV13-1 EN -- AISI/SAE S7 TG S7 Standards IS S7 Chemical Analysis Typical Value % (Min - Max) C Si Mn Cr Mo Ni V W other 0.50 *** CHEMICAL COMPOSITION (%) 0.50 3.25 3.25 1.50 *** 0.25 *** -6 0 -1 COEFFICIENT OF LINEAR THERMAL EXPANSION 10 C 0 20-100 C 11.7 12.9 13.3 14.1 14.3 14.6 13.8 0 20-200 C 0 20-300 C 0 20-400 C 0 20-500 C 0 20-600 C 0 20-700 C 0 Soft Annealing : Heat 810-850 C, cool slowly in furnace. This will produce a maximum brinell hardness of 229. Stress Relieving: To Relieve machining stresses for greater accuracy in hardening - first rough machine, then anneal below the critical 0 649/677 C a minimum of one hour at temperature and cool slowly, then finish machine. 0 Hardening: Harden from a temperature 930-960 C followed by air or oil quenching. Hardness after quenching is 59-61 HRC. 0 Tempering : Tempering temperature: 150-400 C 0 TERMPERING TEMPERATURE ( C) vs HARDNESS (HRC) 0 100 C 59 57 54 52 48 41 53 0 200 C 0 300 C 0 400 C 0 500 C 0 600 C 0 650 C 52 0 550 C 0 Forging Hot forming temperature: 1060-1121 C Machinability : The machinability of S7 alloy may be rated at about 75/80 % of a 1% carbon tool steel. Corrosion Resistance: Corrosion resistance of this alloy is better than that of plain carbon steels. However it will rust unless given protective treatment. Forms manufactured: Please see Dimensional Sales Programe. PRODUCTION PROCESS EAF LF VD ESR BLOOM FORGED (5tons Hammer) Forged Annealed & Turned Hot Rolled & Annealed Peeled (HRAP) Cold Drawn / Centreless Ground : 81.0 - 1000mm : 14.5 - 80.0mm : 2.0 - 14.4mm ANNEALED CONDITION ROUND BAR: UT STANDARD: SEP 1921, (DEC.84)E/e DELIVERY STATUS: As Hot rolled & forged, delivery condition : Annealed REDUCTION RATIO: As 1:4 or 1:5 FLAT BAR: EAF LF VD HOT ROLLED (850) ANNEALED CONDITION FORGED (5TONS HAMMER) HOT ROLLED (910) Forged + Annealed + Turned Bar 81.0 - 1000mm Hot Rolled Annealed & Peeled Bard 14.5 - 80.0mm 2.0 - 14.4mm SIZE: ROUND Cold Drawn/Ground Bar Thickness 5mm - 150mm Width 5mm - 810mm SIZE: FLATS Thickness 5mm - 12mm Width 810mm - 2500mm SIZE: SHEETS 34