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B.S. 1.4568 Details

1.4568 Application:Steel wire for mechanical springs - Part 3: Stainless spring steel wire

Category Type Grade Microstructure Designations
Grades Stainless Steels 1.4568 Precipitation-Hardening UK - B.S. , BS EN 10088-1 - Stainless steels - Part 1: List of stainless steels
BS EN 10088-2 - Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes
BS EN 10088-3 - Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes
BS EN 10088-4 - Stainless steels - Part 4: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes
BS EN 10088-5 - Stainless steels - Part 5: Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes
BS EN 10151 - Stainless steel strip for springs - Technical delivery conditions
BS EN 10270-3 - Steel wire for mechanical springs - Part 3: Stainless spring steel wire

Chemical composition(wt.%) of 1.4568 grade: BS EN 10088-1

Elements Min.(≥) Max.(≤) Similar Remarks
C - 0.09
Si - 0.70
Mn - 1.00
P - 0.04
S - 0.015
Cr 16.00 18.00
Ni 6.50 7.80
Mo - -
Al 0.70 1.50
Steel wire for mechanical springs - Part 3: Stainless spring steel wire

Mechanical properties of grade 1.4568 BS EN 10088-1

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
455 (≥) 248 (≥) 31 43 14 Solution and Aging, Annealing, Ausaging, Q+T,etc 412

Physical properties of grade 1.4568 BS EN 10088-1

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
Expansion rate
992 (≥) 744 (≥) 41 24 32 Solution and Aging, Annealing, Ausaging, Q+T,etc 121
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
252 762 318

1.4568 - Form of Supply

Product type Products Dimension Processes Deliver Status
Plates / Sheets Plates / Sheets 0.08-200mm(T)*W*L 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
X7CrNiAl17-7 B.S. UK
Steel wire for mechanical springs - Part 3: Stainless spring steel wire
1.4568 B.S. UK
Steel wire for mechanical springs - Part 3: Stainless spring steel wire
X7CrNiAl17-7 AFNOR France
Steel wire for mechanical springs - Part 3: Stainless spring steel wire
1.4568 AFNOR France
Steel wire for mechanical springs - Part 3: Stainless spring steel wire
X7CrNiAl17-7 ISO International
Stainless steels - Chemical composition

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