GARBA
-
GARBA 177 PH
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 177 PH
Precipitation hardenable stainless spring wire.
For applications demanding medium fatigue properties.GARBA 177PH is a semi-austenitic precipitation-hardenable stainless steel with high relaxation resistance at elevated temperatures and excellent fatigue properties. This material has good formability and good form stability during the precipitation hardening heat treatment and a moderate level of corrosion resistance.
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Al (%) Ni (%) 0.09 0.70 1.00 0.040 0.015 16.00 - 18.00 0.70 - 1.50 6.50 - 7.80 Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Tensile strength after heat treatment 480C 1h (N/mm²) 0.30 - 0.65 ±0.005 - - 0.66 - 1.01 ±0.008 - - 1.02 - 2.26 ±0.012 - - 2.27 - 4.01 ±0.015 - - 4.02 - 6.26 ±0.020 - - 6.27 - 8.00 ±0.025 - - 0.30 - 0.40 1925 - 2213 2225 - 2525 0.41 - 0.50 1900 - 2185 2200 - 2500 0.51 - 0.65 1850 - 2127 2150 - 2450 0.66 - 0.80 1825 - 2099 2125 - 2425 0.81 - 1.00 1800 - 2070 2100 - 2400 1.01 - 1.25 1750 - 2012 2050 - 2350 1.26 - 1.50 1700 - 1955 2000 - 2300 1.51 - 1.75 1650 - 1897 1950 - 2250 1.76 - 2.00 1600 - 1840 1900 - 2200 2.01 - 2.50 1550 - 1782 1850 - 2150 2.51 - 3.00 1500 - 1725 1800 - 2100 3.01 - 3.50 1450 - 1667 1750 - 2050 3.51 - 4.25 1400 - 1610 1700 - 2000 4.26 - 5.00 1350 - 1552 1650 - 1950 5.01 - 6.00 1300 - 1495 1550 - 1850 6.01 - 8.00 1250 - 1437 1500 - 1800 Surface conditions
Surface performance
AC-surface 0.30–8.00 mm Ø.
The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Physical properties
E and G modulus of elasticity
Abt. 190 kN/mm2 in drawn condition.
Abt. 200 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 73 kN/mm2 in drawn condition.
Abt. 78 kN/mm2 after heat treatment.Heat conductivity
Temperature oC 20 100 300 W/(m* oC) 15.0 15.5 19.0 Resistivity
Temperature oC 20 100 200 300 nΩm 900 950 1000 1050 Linear expansion
Pro oC <30-100 30-200 30-300 x10-6 13.0 13.5 14.0 Specific heat capactity
Temperature oC 100 200 J/(kg* oC) 480 520 Standards
Nearest equivalent steel grades
EN/DIN 1.4568, AISI/SAE 631, JIS SUS 631
Nearest equivalent standards
EN ISO 6931-1, ASTM A313, AMS 5678, BS 2056 301 S81, JIS G4314
Recommendations
Heat treatment
Normal procedure for precipitation hardening is heat treatment at 480oC (896oF) for 1 hour and then air cooling. This should be done as soon as possible after spring coiling. The tensile strength of the wire before and after this treatment is given in the table in previous page.
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.
Relaxation And Fatigue Properties
In diagram 1 the fatigue properties of GARBA 177 PH is illustrated in a Goodman-diagram, based on a special test spring design.
Diagram 2-3 show the relaxation properties (loss of load) of springs made from GARBA 177PH subjected to three different stress levels at different temperatures.
-
GARBA 177 Premium
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 177 Premium
Precipitation hardenable stainless spring wire. Shaved and EC-tested *)
For applications demanding high fatigue propertiesGARBA 177 Premium is a semi-austenitic precipitation-hardenable stainless steel with high relaxation resistance at elevated temperatures and excellent fatigue properties. This material has good formability and good form stability during the precipitation hardening heat treatment and a moderate level of corrosion resistance. The shaved surface improves the fatigue resistance as compared to GARBA 177PH.
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) Al (%) 0.09 0.70 1.00 0.040 0.015 16.00 - 18.00 6.50 - 7.80 0.70 - 1.50 Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Tensile strength after heat treatment 480C 1h (N/mm²) 0.30 - 0.40 ±0.005 1885 - 2165 2205 - 2525 0.41 - 0.50 ±0.008 1860 - 2130 2180 - 2490 0.51 - 0.65 ±0.008 1810 - 2070 2130 - 2430 0.66 - 0.80 ±0.010 1810 - 2060 2130 - 2430 0.81 - 1.00 ±0.010 1780 - 2030 2100 - 2390 1.01 - 1.25 ±0.015 1720 - 1960 2040 - 2310 1.26 - 1.50 ±0.015 1670 - 1910 1990 - 2260 1.51 - 1.75 ±0.015 1610 - 1850 1910 - 2180 1.76 - 2.00 ±0.015 1570 - 1800 1900 - 2160 2.01 - 2.50 ±0.015 1540 - 1770 1860 - 2120 2.51 - 3.00 ±0.020 1500 - 1710 1820 - 2060 3.01 - 3.50 ±0.020 1400 - 1600 1660 - 1940 3.51 - 4.25 ±0.020 1350 - 1550 1620 - 1920 4.26 - 5.00 ±0.025 1310 - 1500 1580 - 1800 5.01 - 5.60 ±0.025 1300 - 1490 1550 - 1790 Surface conditions
Surface performance
AC-surface 0.30–5.60 mm Ø. The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Surface condition
Surface condition – non-destructive testing
In the standard size range 2.00-5,60 mm the wire can be tested continuously in Eddy Current equipment to a surface level of >40 microns.Physical properties
E and G modulus of elasticity
Abt. 190 kN/mm2 in drawn condition.
Abt. 200 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 73 kN/mm2 in drawn condition.
Abt. 78 kN/mm2 after heat treatment.
Density: 7.90 kg/dm3.Heat conductivity
Temperature oC 20 100 300 W/(m* oC) 15.0 15.5 19.0 Linear expansion
Pro oC 30-100 30-200 30-300 x10-6 13.0 13.5 14.0 Standards
Nearest equivalent steel grades
EN/DIN 1.4568, AISI/SAE 631, JIS SUS 631
Nearest equivalent standards
EN ISO 6931-1, ASTM A313, AMS 5678, BS 2056 301 S81, JIS G4314
Recommendations
Heat treatment
Normal procedure for precipitation hardening is heat treatment at 480oC (896oF) for 1 hour and then air cooling. This should be done as soon as possible after spring coiling. The tensile strength of the wire before and after this treatment is given in the table in previous page.
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. -
GARBA 177 Supreme
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 177 Supreme
Precipitation hardenable stainless spring wire. Shaved and EC-tested*. For applications demanding superior fatigue properties
GARBA 177 Supreme® is a semi-austenitic precipitation-hardenable stain¬less steel, processed by ESR (Electro Slag Refining), which reduces the risk of harmful inclusions. The ESR process together with a shaved surface improves the fatigue resistance as compared to GARBA 177PH.
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) Al (%) 0.09 0.70 1.00 0.040 0.015 16.00 - 18.00 6.50 - 7.80 0.70 - 1.50 Cleanliness in steel
The presence of non-metallic inclusions in the wire rod is
inspected for every heat in accordance with the Suzuki
Garphyttan method by the steel supplier.For wire rod samples: Inclusion size max. 15 µm down to 1 mm below surface. Inspection area: 350 mm2.
Inclusion size, surface 5–10 > 10–15 >15 µm Max. number of inclusions Max grade D3
acc. to JK scale*20 0 * Method for assessment of the content of non-metallic inclusions. Swedish Standard SS 111116 – Microscopic methods – Jernkontoret’s inclusion chart II for the assessment of non-metallic inclusions.
Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) Tensile strength after heat treatment 480C 1h (N/mm²) 0.30 - 0.40 ±0.005 1885 - 2165 2205 - 2525 0.41 - 0.50 ±0.008 1860 - 2130 2180 - 2490 0.51 - 0.65 ±0.008 1810 - 2070 2130 - 2430 0.66 - 0.80 ±0.010 1810 - 2060 2130 - 2430 0.81 - 1.00 ±0.010 1780 - 2030 2100 - 2390 1.01 - 1.25 ±0.015 1720 - 1960 2040 - 2310 1.26 - 1.50 ±0.015 1670 - 1910 1990 - 2260 1.51 - 1.75 ±0.015 1610 - 1850 1910 - 2180 1.76 - 2.00 ±0.015 1570 - 1800 1900 - 2160 2.01 - 2.50 ±0.015 1540 - 1770 1860 - 2120 2.51 - 3.00 ±0.020 1500 - 1710 1820 - 2060 3.01 - 3.50 ±0.020 1400 - 1600 1660 - 1940 3.51 - 4.25 ±0.020 1350 - 1550 1620 - 1920 4.26 - 5.00 ±0.025 1310 - 1500 1580 - 1800 5.01 - 5.60 ±0.025 1300 - 1490 1550 - 1790 Surface conditions
Surface performance
AC-surface 0.30–5.60 mm Ø . The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Surface condition
Surface condition – non-destructive testing
In the standard size range 2.00-5,60 mm the wire can be tested continuously in Eddy Current equipment to a surface level of >40 microns.Physical properties
E and G modulus of elasticity
Abt. 190 kN/mm2 in drawn condition.
Abt. 200 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 73 kN/mm2 in drawn condition.
Abt. 78 kN/mm2 after heat treatment.
Density: 7.90 kg/dm3.Heat conductivity
Temperature oC 20 100 300 W/(m* oC) 15.0 15.5 19.0 Resistivity
Temperature ºC 20 100 200 300 nΩm 900 950 1000 1050 Linear expansion
Pro oC 30-100 30-200 30-300 x10-6 13.0 13.5 14.0 Specific heat capactity
Temperature oC 100 200 J/(kg* oC) 480 520 Standards
Nearest equivalent steel grades
EN/DIN 1.4568, AISI/SAE 631, JIS SUS 631
Nearest equivalent standards
EN ISO 6931-1, ASTM A313, AMS 5678, BS 2056 301 S81, JIS G4314
Recommendations
Electro slag refining (ESR) process
For applications demanding superior fatigue properties
Electro Slag Refining (ESR) process
ESR process, see figure 1.
The ESR process gives a material with lower level of inclusions compared to a material not processed with ESR and in addition also a better segregation level.
Material properties achieved by ESR in combination with shaved wire surface and precipitation hardening result in superior fatigue resistance.Shaved and Eddy Current tested
Suzuki Garphyttan uses the most advanced Eddy Current testing equip¬ment available on the market. Experience from many years of surface testing in efficient continuous testing lines is a guarantee for high quality spring wire.
Eddy Current testing is carried out on material with high demands on surface quality. EC-testing is performed with both rotating (R) and stationary (D) probe test equipment.
Steel grade Dimension, mm ESR Shaved Unshaved RD40 GARBA 177 Supreme® 0.30 – 1.99 x x - - GARBA 177 Supreme® 2.00 – 5.60 x x - x
Steel grade Dimension, mm ESR Shaved Unshaved RD40
GARBA 177 Supreme® 0.30 – 1.99 X X – –
GARBA 177 Supreme® 2.00 – 5.60 X X – XHeat treatment
Normal procedure for precipitation hardening is heat treatment at 480oC (896oF) for 1 hour and then air cooling. This should be done as soon as possible after spring coiling. The tensile strength of the wire before and after this treatment is given in the table in previous page.
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.Relaxation And Fatigue Properties
In diagram 1 the fatigue properties of GARBA 177 Supreme® is illustrated in a Goodman-diagram, based on a special test spring design.
Diagram 2-3 show the relaxation properties (loss of load) of springs made from GARBA 177 Supreme® subjected to three different stress levels at different temperatures.
-
GARBA 178Mo
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 178Mo
Stainless spring wire. Similar to EN 1.4310 with increased tensile strength
GARBA 178Mo is a general-purpose austenitic stainless steel that is used for springs and other components requiring good fatigue resistance and good resistance against atmospheric corrosion. Addition of molybdenum increases the tensile strength as compared to GARBA 188 and also increases the resistance against localised and general corrosion.
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) Mo (%) 0.05 - 0.15 2.00 2.00 0.045 0.015 16.00 - 19.00 6.00 - 9.50 0.80 Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) 0.30 - 0.65 ±0.008 - 0.66 - 1.01 ±0.010 - 1.02 - 2.26 ±0.015 - 2.27 - 4.01 ±0.020 - 4.02 - 6.26 ±0.025 - 6.27 - 8.00 ±0.030 - 0.30 - 0.40 2250 - 2590 0.41 - 0.50 2200 - 2530 0.51 - 0.65 2150 - 2470 0.66 - 0.80 2100 - 2420 0.81 - 1.00 2050 - 2360 1.01 - 1.25 2000 - 2300 1.26 - 1.50 1950 - 2240 1.51 - 1.75 1900 - 2190 1.76 - 2.00 1850 - 2130 2.01 - 2.50 1750 - 2010 2.51 - 3.00 1700 - 1960 3.01 - 3.50 1650 - 1900 3.51 - 4.25 1600 - 1840 4.26 - 5.00 1550 - 1780 5.01 - 6.00 1500 - 1730 6.01 - 7.00 1450 - 1670 7.01 - 8.00 1400 - 1610 Surface conditions
Surface performance
AC-surface 0.30–8.00 mm Ø. The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Physical properties
E and G modulus of elasticity
Abt. 180 kN/mm2 in drawn condition.
Abt. 185 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 70 kN/mm2 in drawn condition.
Abt. 73 kN/mm2 after heat treatment.Heat conductivity
Temperature °C 20 100 200 400 W/(m* °C) 15.0 16.0 18.0 20.0 Resistivity
Temperature oC 20 100 200 300 nΩm 700 750 800 950 Linear expansion
Pro °C 30–100 30–200 30–400 x10 –6 17.0 17.5 18.5 Specific heat capactity
Temperature oC 20 100 200 400 J/(kg* oC) 440 480 520 560 Standards
Nearest equivalent steel grades
EN/DIN 1.4310, AISI/SAE 302
Nearest equivalent standards
EN ISO 6931-1, ASTM A313, BS 2056 302 S26
Recommendations
Heat treatment
As soon as possible after coiling, the springs should be stress relieved.
Recommended temperature for compression springs or tension springs without initial tension is approx. 420 ºC for 0.5 - 4 hours. -
GARBA 1812Mo
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 1812Mo
Stainless spring wire
GARBA 1812Mo is an austenitic stainless steel, which as compared to GARBA 178Mo offers a higher resistance against intergranular corrosion due to lower carbon content. The higher content of molybdenum also increases the resistance against general corrosion.
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) Mo (%) 0.07 1.00 2.00 0.045 0.015 16.50 - 18.50 10.00 - 13.00 2.00 - 3.00 Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) 0.30 - 0.65 ±0.008 - 0.66 - 1.01 ±0.010 - 1.02 - 2.26 ±0.015 - 2.27 - 4.01 ±0.020 - 4.02 - 6.26 ±0.025 - 6.27 - 8.00 ±0.030 - 0.30 - 0.40 1675 - 1930 0.41 - 0.50 1650 - 1900 0.51 - 0.65 1625 - 1870 0.66 - 0.80 1600 - 1840 0.81 - 1.00 1575 - 1810 1.01 - 1.25 1550 - 1780 1.26 - 1.50 1500 - 1730 1.51 - 1.75 1450 - 1670 1.76 - 2.00 1400 - 1610 2.01 - 2.50 1350 - 1550 2.51 - 3.00 1300 - 1500 3.01 - 3.50 1250 - 1440 3.51 - 4.25 1225 - 1410 4.26 - 5.00 1200 - 1380 5.01 - 6.00 1150 - 1320 6.01 - 7.00 1125 - 1290 7.01 - 8.00 1075 - 1240 Surface conditions
Surface performance
AC-surface 0.30–8.00 mm Ø. The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Physical properties
E and G modulus of elasticity
Abt. 175 kN/mm2 in drawn condition.
Abt. 180 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 68 kN/mm2 in drawn condition.
Abt. 71 kN/mm2 after heat treatment.
Density: 8.00 kg/dm3.Heat conductivity
Temperature oC 20 100 200 400 W/(m*oC) 13.5 14.5 15.5 18.5 Resistivity
Temperature oC 20 100 200 400 nΩm 750 800 850 1000 Linear expansion
Pro oC 30-100 30-200 30-400 x10-6 16.5 17.0 18.0 Specific heat capactity
Temperature oC 20 100 200 400 J/(kg*oC) 440 480 520 560 Standards
Nearest equivalent steel grades
EN/DIN 1.4401, AISI/SAE 316, JIS SUS 316
Nearest equivalent standards
EN ISO 6931-1, ASTM A313, BS 2056 316 S42, JIS G4314
Recommendations
Heat treatment
As soon as possible after coiling, the springs should be stress relieved.
Recommended temperature for compression springs or tension springs without initial tension is approx. 420 ºC for 0.5 - 4 hours. -
GARBA 188
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 188
Stainless spring wire
GARBA 188 is a general-purpose austenitic stainless steel, which is used for springs and other components requiring good fatigue resistance. The formability is excellent and the corrosion resistance is good against atmospheric corrosion
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) 0.05 - 0.15 2.00 2.00 0.045 0.015 16.00 - 19.00 6.00 - 9.50 Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) 0.30 - 0.65 ±0.008 - 0.66 - 1.01 ±0.010 - 1.02 - 2.26 ±0.015 - 2.27 - 4.01 ±0.020 - 4.02 - 6.26 ±0.025 - 6.27 - 8.00 ±0.030 - 0.30 - 0.30 2150 - 2470 0.31 - 0.40 2100 - 2420 0.41 - 0.50 2050 - 2360 0.51 - 0.65 2000 - 2300 0.66 - 0.80 1950 - 2240 0.81 - 1.00 1900 - 2190 1.01 - 1.25 1850 - 2130 1.26 - 1.50 1800 - 2070 1.51 - 1.75 1750 - 2010 1.76 - 2.00 1700 - 1960 2.01 - 2.50 1650 - 1900 2.51 - 3.00 1600 - 1840 3.01 - 3.50 1550 - 1780 3.51 - 4.25 1500 - 1730 4.26 - 5.00 1450 - 1670 5.01 - 6.00 1400 - 1610 6.01 - 7.00 1350 - 1550 7.01 - 8.00 1300 - 1500 Surface conditions
Surface performance
AC-surface 0.30–8.00 mm Ø. The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Physical properties
E and G modulus of elasticity
Abt. 180 kN/mm2 in drawn condition.
Abt. 185 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 70 kN/mm2 in drawn condition.
Abt. 73 kN/mm2 after heat treatment.
Density: 7.90 kg/dm3.Heat conductivity
Temperature oC 20 100 200 400 W/(m* oC) 15.0 15.5 17.5 20.0 Resistivity
Temperature oC 20 100 200 300 nΩm 700 750 800 950 Linear expansion
Pro oC 30-100 30-200 30-300 x10-6 17.0 17.5 18.5 Specific heat capactity
Temperature oC 20 100 200 400 J/(kg* oC) 440 480 520 560 Standards
Nearest equivalent steel grades
EN/DIN 1.4310, AISI/SAE 302, JIS SUS 302
Nearest equivalent standards
EN ISO 6931-1, ASTM A313, AMS 5688, BS 2056 302 S26, JIS G4314
Recommendations
Heat treatment
As soon as possible after coiling, the springs should be stress relieved.
Recommended temperature for compression springs or tension springs without initial tension is approx. 350ºC for 0.5 - 3 hours. -
GARBA 188L
Suzuki Garphyttan www.suzuki-garphyttan.com
GARBA 188L
Stainless spring wire
GARBA 188 is a general-purpose austenitic stainless steel, which is used for springs and other components requiring good fatigue resistance. GARBA 188L has a higher formability as compared to GARBA 188 due to its lower carbon content.
Chemical composition
C (%) Si (%) Mn (%) P max. (%) S max. (%) Cr (%) Ni (%) 0.08 1.00 2.00 0.040 0.015 18.00 - 20.00 8.50 - 10.00 Mechanical properties
For round wire
Diameter (mm) Tolerance (mm) Tensile Strength (N/mm²) 0.30 - 0.50 ±0.005 - 0.51 - 0.70 ±0.008 - 0.71 - 0.83 ±0.009 - 0.84 - 1.00 ±0.010 - 1.01 - 1.60 ±0.011 - 1.61 - 2.50 ±0.014 - 2.51 - 4.00 ±0.018 - 4.01 - 6.30 ±0.022 - 6.31 - 8.00 ±0.028 - 0.30 - 0.40 1785 - 2000 0.41 - 0.70 1700 - 1910 0.71 - 1.00 1650 - 1830 1.01 - 1.50 1530 - 1740 1.51 - 2.00 1445 - 1650 2.01 - 2.80 1360 - 1570 2.81 - 4.00 1275 - 1490 4.01 - 6.00 1190 - 1400 6.01 - 8.00 1105 - 1320 Surface conditions
Surface performance
AC-surface 0.30–8.00 mm Ø. The AC-coating can be removed before heat treatment by using a 10-20% nitric acid pickle at room temperature.Physical properties
E and G modulus of elasticity
Abt. 180 kN/mm2 in drawn condition.
Abt. 185 kN/mm2 after heat treatment.E and G modulus of shear
Abt. 70 kN/mm2 in drawn condition.
Abt. 73 kN/mm2 after heat treatment.
Density: 7.90 kg/dm3.Heat conductivity
Temperature oC 20 100 200 400 W/(m* oC) 15.0 15.5 17.5 20.0 Linear expansion
Pro oC 30-100 30-200 30-300 x10-6 17.0 17.5 18.5 Standards
Nearest equivalent steel grades
EN/DIN 1.4301, AISI/SAE 304, JIS SUS 304
Nearest equivalent standards
ASTM A313, BS 2056 304 S15, JIS G4314
Recommendations
Heat treatment
As soon as possible after coiling, the springs should be stress relieved.
Recommended temperature for compression springs or tension springs without initial tension is approx. 350ºC for 0.5 - 3 hours.