ISO 21 - Special Alloy - Special Steel

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**ISO 21** Application:ISO standard thermal deformation of stainless steel
Category	Type	Steel grade	Standard	Country
Grades	Special Alloy	ISO 21	ISO	ISO

Chemical composition % of the ladle analysis of grade ISO 21

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Mo(％)	Ti(%)
Max 0.080	Max 1.00	Max 2.00	Max 0.045	Max 0.030	16.5-18.5	10.5-13.5	2.00-2.50	5xC%≤Ti≤0.60

ISO standard thermal deformation of stainless steel

Mechanical properties of grade ISO 21
Proof strength R_p0.2 (MPa)	Tensile strength R_m (MPa)	Impact energy KV (J)	Elongation at fracture A (%)	Reduction in cross section on fracture Z (%)	As-Heat-Treated Condition	Brinell hardness (HBW)
711 (≥)	824 (≥)	31	14	42	Solution and Aging, Annealing, Ausaging, Q+T,etc	132

Physical properties of grade ISO 21
Property	Density kg/dm3	Temperature T °C/F	Specific heat J / kgK	Thermal conductivity W/mK	Electric resistance µΩ·cm	Modulus of elasticity kN/mm2
883 (≥)	552 (≥)	34	12	24	Solution and Aging, Annealing, Ausaging, Q+T,etc	323
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0) N/mm2	Creep rupture strength (10000h) (Rp1,0) N/mm2
117	259	526

ISO 21 Range of products
Product type	Products	Dimension	Processes	Deliver Status
Plates / Sheets	Plates / Sheets	0.08-200mm(T)WL	Forging, hot rolling and cold rolling	Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel Bar	Round Bar, Flat Bar, Square Bar	Φ8-1200mm*L	Forging, hot rolling and cold rolling, Cast	Black, Rough Turning, Shot Blasting,
Coil / Strip	Steel Coil /Steel Strip	0.03-16.0x1200mm	Cold-Rolled & Hot-Rolled	Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / Tubes	Seamless Pipes/Tubes, Welded Pipes/Tubes	OD:6-219mm x WT:0.5-20.0mm	Hot extrusion, Cold Drawn, Welded	Annealed, Solution and Aging, Q+T, ACID-WASHED

Cross Reference Table(Equivalent Grade)
Grade	Standard	Country	Application
1Cr21Ni5Ti	ISO	ISO	Cold rolled stainless steel sheets and plates
5Cr21Mn9Ni4N	ISO	ISO	Heat-resisting steel bars
2Cr21Ni12N	ISO	ISO	Heat-resisting steel bars
GH2130	ISO	ISO	Classification and designation for superalloys and high temperature intermetallic materials
GH2132	ISO	ISO	Classification and designation for superalloys and high temperature intermetallic materials
GH2135	ISO	ISO	Classification and designation for superalloys and high temperature intermetallic materials
GH2136	ISO	ISO	Classification and designation for superalloys and high temperature intermetallic materials
XM-31	ISO	ISO	Chemical compositions of SAE wrought stainless steels
S21400	ISO	ISO	Chemical compositions of SAE wrought stainless steels
S21460	ISO	ISO	Annealed or Cold-Worked Austenitic Stainless Steel Sheet, Strip, Plate, and Flat Bar
S21500	ISO	ISO	Austenitic Chromium Manganese Nickel Molybdenum Stainless Steel
216	ISO	ISO	Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
SA-479 Type XM-17	ISO	ISO	Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 240 Type XM-17	ISO	ISO	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 479 XM-17	ISO	ISO	Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels
A 492 Type XM-17	ISO	ISO	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 959 Type XM-17	ISO	ISO	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
S21600	ISO	ISO	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
216L	ISO	ISO	Chemical compositions of SAE wrought stainless steels
S21603	ISO	ISO	Austenitic Chromium Manganese Nickel Molybdenum Stainless Steel