Specification Stainless spring steel

Size: px
Start display at page:

Download "Specification Stainless spring steel"

Transcription

1 Specification Class: Semifinished Products of Steel Class No.:15 Stainless Spring Steel JED 5M Previous Edition Abbreviated Title 21-1 Stainless spring steel Scope The specification refers to cold-worked round spring steel wire from stainless steel in the following types: JED-5M JED-5M1 with normal tensile strength, for the manufacture of springs; with high tensile strength and fatigue limit, for the manufacture of springs. Springs according to both types have to be tempered after winding. The specification also refers to cold-worked strips from stainless steel in the following types: JED-5M JED-5M2 JED-5M3 JED-5M4 for the manufacture of springs. For springs wich are made from strips, tempering after manufacturing is not mandatory according for this type. for the manufacture of springs. Tempering after the springs are manufactured has to be done. with lower tensile strength, for the manufacture of clamps. with lower tensile strength, for the manufacture of tolerence ring If JED-5M is indicated on the drawing, JED-5M shall be applied. 2 General requirements The finished parts shall be homogeneous and free from pores, blisters and other defects, the parts shall have a smooth surface according to the applied shaping process. The parts must not show any defects such as cracks, voids, etc. within their structure. The requirements for finished parts can be taken from the drawing and the special part specification. This specification lists minimal properties resulting as a summary from different national and international standards. For the supply of products only one of those materials may be chosen which is released in one of the documents Release of Material belonging to this specification. If narrower limits for the material properties than defined in this specification or additional requirements are defined in the standards referenced there, these narrower limits are binding for deliveries and the additional requirements are valid as well. 3 Thermal range of application Continuous operational temperature range: -6 C to +2 C Continuation page 2 to 5 Compiler Approved Product Group: 4961 Rejisha C P JED.dot Template version 3 Shanmugam S Doc. Code Language Rev. 8 - en - F

2 Increase of tensile strength [MPa], JED-5M : Page 2 4 Properties 4.1 Mechanical properties Type JED-5M Tensile strength in spring-hard drawn condition for wires Diameter Tensile strength min. Tensile strength in spring-hard rolled condition for strips Thickness of strip Tensile strength up to.2 22,1 to,25 1 to 19 >,2 to,3 215 >,25 to,5 16 to 18 >,3 to,4 21 >,5 to,5 15 to 1 >,4 to,5 25 >,5 to 1, 14 to 16 >,5 to,65 2 > 1, to 1,6 135 to 155 >,65 to,8 195 >,8 to 1, 19 > 1, to 1, > 1,25 to 1,5 18 > 1,5 to 1,5 15 > 1,5 to 2, 1 > 2, to 2,5 165 > 2,5 to 3, 16 > 3, to 3,5 155 > 3,5 to 4,25 15 > 4,25 to 5, 145 > 5, to 6, 14 > 6, to, 135 >, to 8,5 13 > 8,5 to 1, 125 Modulus of elasticity (cold-worked [kn/mm²] (tempered [kn/mm²] Modulus of rigidity (cold-worked 5 [kn/mm²] (tempered 3 5 [kn/mm²] By tempering, the tensile strength of the wires is increased in a range as defined by the following diagram: Wire diameter

3 Tensile strength after heat treatment [MPa] Increase of tensile strength [MPa], JED-5M : Page Type JED-5M1 Tensile strength for wires Diameter to,2 235 >,2 to,3 23 >,3 to,4 225 >,4 to,5 22 >,5 to, >,65 to,8 21 >,8 to 1, 25 > 1, to 1,25 2 > 1,25 to 1,5 195 > 1,5 to 1,5 19 > 1,5 to 2, 185 > 2, to 2,5 15 > 2,5 to 3, 1 > 3, to 3,5 165 > 3,5 to 4,25 16 > 4,25 to 5, 155 > 5, to 6, 15 > 6, to, 145 >, to 8,5 14 > 8,5 to 1, 135 Tensile strength min. By tempering, the tensile strength of the wires is increased in a range as defined by the following diagram: Wire diameter Modulus of elasticity (cold-worked [kn/mm²] (tempered [kn/mm²] Modulus of rigidity (cold-worked 5 [kn/mm²] (tempered 3 5 [kn/mm²] Type JED-5M2 Tensile strength in spring-hard rolled condition as defined under JED-5M. By tempering, the tensile strength of the wires is increased in a range as defined by the following diagram: Modulus of elasticity (tempered [kn/mm²] Modulus of rigidity (tempered 3 5 [kn/mm²] Tensile strength prior to heat treatment (cold rolled [MPa]

4 JED-5M : Page Type JED-5M3 Tensile strength : 93 to 115 Modulus of elasticity (cold-worked [kn/mm²] Modulus of rigidity (cold-worked 5 [kn/mm²] Type JED-5M4 Tensile strength : 113 Elongation 5 % Modulus of elasticity (cold-worked [kn/mm²] Modulus of rigidity (cold-worked 5 [kn/mm²] 4.2 Chemical composition [%] (all types Carbon (C: max.,15 Silicon (Si: max. 2, Manganese (Mn: max. 2, Phosphorus (P: max.,45 Sulphur (S: max.,3 Chromium (Cr: 16, to 19, Molybdenum (Mo: max.,8 Nickel (Ni: 6, to 1, Nitrogen (N: max., Further properties Not suitable for welding, good suitability for machining. Fatigue limit for JED-5M, without shot-peening according to following diagram, depending on wire diameter d:

5 JED-5M : Page ko( d kh(1 N= ku(1 12 Compression springs made of wire according to JED-5M1 have a fatigue limit which is at least 1 % higher Conditions of delivery 1 The material and the finished parts must correspond to the technical conditions of delivery defined in JED