KD

  1. 70 KD
    Suzuki Garphyttan www.suzuki-garphyttan.com

    70 KD

    Oil tempered SiCr-alloyed clutch and transmission spring wire

    70 KD is especially intended for the manufacture of clutch and transmission springs and similar moderately high fatigue stressed springs. 70 KD S is a shaved version of 70 KD intended for applications with higher surface requirements. The material has good relaxation properties. The wire is manufactured in sizes from Ø 0.50 to 7.00 mm. Sizes from Ø 7.00 to 15.00 mm is manufactured in unshaved version. Other wire sizes and shapes on request.

    Chemical composition

    C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%)
    0.50 - 0.60 1.20 - 1.60 0.50 - 0.80 0.025 0.020 0.50 - 0.80

    Cleanliness in steel

    Non-metallic inclusions:
    Max. level 2 according to DIN 50602-M.
    Corresponding standard: ASTM E-45-A.

    Mechanical properties

    1) Other wire sizes on request.
    2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
    3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength Rm within one coil does not vary more than 60 N/mm2.
    4) Torsion test is carried out at ≤ 6.0 mm for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire axis. The rupture shall show no longitudinal cracks.

    For round wire

    Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Torsions (l=300 mm, min. revs) Reduct. of area (min. %)
    0.50 - 0.80 ±0.010 2080 - 2210 6
    0.81 - 1.30 ±0.015 2080 - 2210 5 50
    1.31 - 1.40 ±0.015 2080 - 2210 5 50
    1.41 - 1.60 ±0.020 2080 - 2210 5 50
    1.61 - 2.00 ±0.020 2010 - 2160 5 50
    2.01 - 2.50 ±0.020 1960 - 2060 5 50
    2.51 - 3.00 ±0.020 1910 - 2010 4 50
    3.01 - 3.20 ±0.020 1910 - 2010 4 45
    3.21 - 3.50 ±0.025 1910 - 2010 4 45
    3.51 - 4.50 ±0.025 1860 - 1960 4 45
    4.51 - 5.00 ±0.025 1810 - 1910 3 45
    5.01 - 5.60 ±0.030 1810 - 1910 3 40
    5.61 - 6.00 ±0.035 1760 - 1860 3 40
    6.01 - 6.50 ±0.035 1760 - 1860 40
    6.51 - 7.00 ±0.040 1710 - 1810 30
    7.01 - 8.00 ±0.045 1710 - 1810 30
    8.01 - 9.00 ±0.045 1660 - 1760 30
    9.01 - 10.00 ±0.050 1660 - 1760 30
    10.01 - 12.00 ±0.060 1610 - 1760 30
    12.01 - 15.00 ±0.060 1610 - 1760 30

    Yield point

    The proof stress Rp0.2 is min. 0.9 x tensile strength of the wire.

    Surface conditions

    Surface condition – non-destructive testing
    In the standard size range 2.00 - 6.00 mm the wire is tested continuously in Eddy Current equipment ; for 70 KD a level of 60 microns and for 70 KD S of 40 microns. For 70 KDS diameter 6.60-8.60 mm, 60 microns. For size range 6.01-8.60 mm unshaved is tested continuously in Eddy Current equipment to a surface level of ≥ 80 microns. For diameter 6.60 - 8.60 unshaved 80 microns. For diameter 2.70-15.00 mm unshaved 100 microns.

    Surface condition – end sample test
    The wire is end sample tested by means of etch testing and binocular inspection as well as microscopical inspection of the material structure. Max. permissible depth of partial surface decarburization and surface defects, 1.3% x wire diameter. No complete decarburization allowed.

    Surface condition

    Surface condition – non-destructive testing
    In the standard size range 2.00 - 6.00 mm the wire is tested continuously in Eddy Current equipment ; for 70 KD a level of 60 microns and for 70 KD S of 40 microns. For 70 KDS diameter 6.60-8.60 microns. For size range 6.01-8.60 mm unshaved is tested continuously in Eddy Current equipment to a surface level of ≥ 80 microns. For diameter 6.60 - 8.60 unshaved 80 microns. For diameter 2.70-15.00 mm unshaved 100 microns.

    Surface condition – end sample test
    The wire is end sample tested by means of etch testing and binocular inspection as well as microscopical inspection of the material structure. Max. permissible depth of partial surface decarburization and surface defects, 1.3% x wire diameter. No complete decarburization allowed.

    Physical properties

    E and G modulus of elasticity

    206 kN/mm²

    E and G modulus of shear

    79.5 kN/mm²

    Standards

    Nearest equivalent steel grades

    EN TDSiCr, SIS 142090-05

    Nearest equivalent standards

    ASTM A1000 A, BS 2803 685A55ND

    Recommendations

    Heat treatment

    As soon as possible after coiling, the springs should be stress relieved.

    Hot presetting

    After shot peening, the springs should be hot preset or stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.

    Shot peening

    In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment. Shot peening of the inside of the spring coils is particularly critical.
  2. 75 KD
    Suzuki Garphyttan www.suzuki-garphyttan.com

    75 KD

    Oil tempered SiCrV-alloyed clutch and transmission spring wire

    75 KD is especially intended for the manufacture of clutch and transmission springs and similar moderately high fatigue stressed springs.
    75 KD S is a shaved version of 75 KD intended for applications with higher surface requirements.
    The material has good relaxation properties. The wire is manufactured in sizes from Ø 1.60 to 7.00 mm. Other wire sizes and shapes on request.

    Chemical composition

    C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) V (%)
    0.50 - 0.70 1.20 - 1.65 0.50 - 0.80 0.025 0.020 0.50 - 1.00 0.05 - 0.20

    Cleanliness in steel

    Non-metallic inclusions:
    Max. level 2 according to DIN 50602-M.
    Corresponding standard: ASTM E-45-A.

    Mechanical properties

    1) Other wire sizes on request.
    2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
    3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength Rm within one coil does not vary more than 60 N/mm2.
    4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire axis. The rupture shall show no longitudinal cracks.

    For round wire

    Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Torsions (l=300 mm, min. revs) Reduct. of area (min. %)
    1.60 - 2.00 ±0.020 2160 - 2310 5 45
    2.01 - 2.50 ±0.020 2110 - 2210 5 45
    2.51 - 3.20 ±0.020 2060 - 2160 4 45
    3.21 - 4.00 ±0.025 2010 - 2110 4 45
    4.01 - 5.00 ±0.025 1960 - 2060 4 45
    5.01 - 5.60 ±0.030 1910 - 2010 4 40
    5.61 - 6.00 ±0.035 1910 - 2010 3 40
    6.01 - 6.50 ±0.035 1910 - 2010 40
    6.51 - 7.00 ±0.035 1860 - 2010 40

    Yield point

    The proof stress Rp0.2is min. 0.9 x tensile strength of the wire.

    Surface conditions

    Surface condition

    Surface condition – non-destructive testing
    In the standard size range 2.00 - 6.00 mm the wire is tested continuously in Eddy Current equipment; for 75 KD a level of 60 microns and for 75 KD S of 40 microns.
    Surface condition – end sample test
    The wire is end sample tested by means of etch testing and binocular inspection as well as microscopical inspection of the material structure.
    Max. permissible depth of partial surface decarburization and surface defects, 1.3% x wire diameter. No complete decarburization allowed.

    Physical properties

    E and G modulus of elasticity

    206 kN/mm²

    E and G modulus of shear

    79.5 kN/mm²

    Standards

    Nearest equivalent steel grades

    EN TDSiCrV

    Nearest equivalent standards

    ASTM A1000 D

    Recommendations

    Heat treatment

    As soon as possible after coiling, the springs should be stress relieved.

    Hot presetting

    After shot peening, the springs should be hot preset or stress relieved. In order to reach optimum fatigue and relaxation properties, the springs must be preset at an appropriate stress.

    Shot peening

    In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment. Shot peening of the inside of the spring coils is particularly critical.
  3. 75 KDH
    Suzuki Garphyttan www.suzuki-garphyttan.com

    75 KDH

    Oil tempered SiCrV-alloyed spring wire

    75 KDH is especially intended for the manufacture of springs exposed to high static loads or low cycle fatigue applications specially intended for trunk opening springs.

    75 KDH is a SiCrV spring steel with elevated tensile strength.

    The material has good relaxation properties. The wire is manufactured in sizes from Ø 2.50 to 5.00 mm. Other wire sizes on request.

    Chemical composition

    C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) V (%)
    0.50 - 0.70 1.35 - 1.60 0.40 - 0.80 0.025 0.020 0.50 - 0.80 0.05 - 0.20

    Cleanliness in steel

    Non-metallic inclusions:
    Max. level 2 according to DIN 50602-M.
    Corresponding standard: ASTM E-45-A.

    Mechanical properties

    1) Other wire sizes on request.
    2) Ovality, i. e. the difference between the largest and smallest dimension of a cross section, is maximum half the tolerance range.
    3) Conversion from tensile strength to hardness values can be calculated in standard ISO EN 18265. The tensile strength Rm within one coil does not vary more than 60 N/mm2.
    4) Torsion test is carried out for assessing deformability. The fracture of the torsion test piece shall be smooth and perpendicular to the wire axis. The rupture shall show no longitudinal cracks.

    For round wire

    Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Torsions (l=300 mm, min. revs) Reduct. of area (min. %)
    2.50 - 3.20 ±0.020 2240 - 2340 4 40
    3.21 - 3.50 ±0.025 2240 - 2340 3 40
    3.51 - 4.00 ±0.025 2220 - 2320 3 40
    4.01 - 4.50 ±0.025 2220 - 2320 3 38
    4.51 - 5.00 ±0.030 2200 - 2300 3 38

    Yield point

    The proof stress Rp0.2 is min. 0.87 x tensile strength of the wire.

    Surface conditions

    Surface condition

    Surface condition – end sample test
    The wire is end sample tested by means of etch testing and binocular inspection as well as microscopical inspection of the material structure.

    Max. permissible depth  of  partial  surface  decarburization and surface defects,  1.3%  x wire diameter.  No complete decarburization allowed.

    Physical properties

    E and G modulus of elasticity

    206 kN/mm²

    E and G modulus of shear

    79.5 kN/mm²

    Standards

    Nearest equivalent steel grades

    EN TDSiCrV

    Nearest equivalent standards

    EN 10270-2

    Recommendations

    Heat treatment

    As soon as possible after coiling, the springs should be stress relieved.

    Hot presetting

    After shot  peening,  the  springs  should  be  hot  preset  or
    stress relieved. In order to reach optimum fatigue and relax- ation properties, the springs must be preset at an appropriate stress.

    Shot peening

    In order to obtain optimum fatigue properties, the process time should be adjusted to get a complete treatment. Size of shots should be adapted to wire dimension, pitch and shot peening equipment. Shot peening of the inside of the spring coils is particularly critical.