GARBA 177 Supreme

Property	Value
E modulus of elasticity	Abt. 190 kN/mm2 in drawn condition.	Abt. 200 kN/mm2 after heat treatment.
G modulus of shear	Abt. 73 kN/mm2 in drawn condition.	Abt. 78 kN/mm2 after heat treatment.
Density	7.90 kg/dm3

Steel grades and product standards

Nearest equivalent product standards	EN ISO 6931-1	ASTM A313	AMS 5678	BS 2056 301 S81	JIS G4314
Nearest equivalent steel grades	EN/DIN 1.4568	AISI/SAE 631	JIS SUS 631

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

Element	Weight %
C	0.09%
Si	0.70%
Mn	1.00%
P max.	0.040%
S max.	0.015%
Cr	16.00% - 18.00%
Ni	6.50% - 7.80%
Al	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.

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.

Heat conductivity

Temperature °C	20	100	300
W/(m* °C)	15.0	15.5	19.0

Resistivity

Temperature °C	20	100	200	300
nΩm	900	950	1000	1050

Linear expansion

Pro °C	30-100	30-200	30-300
x10⁻⁶	13.0	13.5	14.0

Specific heat capacity

Temperature °C	100	200
J/(kg °C)	480	520

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 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.

Document	Download
Product specification	Suzuki-Garphyttan-GARBA-177-Supreme (PDF, 1 MB)

Interested in this product?

Very high fatigue with excellent surface condition

Stainless Steel

Moderate temperatures

Product information

Technical specification

Mechanical properties

Chemical composition

Surface conditions

Physical properties

Recommendations

Documents

Steel grades and product standards

For round wire

Cleanliness in steel

SURFACE CONDITION

Heat conductivity

Resistivity

Linear expansion

Specific heat capacity

Heat treatment

Shot peening

Relaxation and fatigue properties

Applications using GARBA 177 Supreme

Fuel injection spring

GARBA 177 Supreme

Interested in this product?

Very high fatigue with excellent surface condition

Stainless Steel

Moderate temperatures

Product information

Technical specification

Mechanical properties

Chemical composition

Surface conditions

Physical properties

Recommendations

Documents

Steel grades and product standards

For round wire

Cleanliness in steel

SURFACE CONDITION

Heat conductivity

Resistivity

Linear expansion

Specific heat capacity

Heat treatment

Shot peening

Relaxation and fatigue properties

Applications using GARBA 177 Supreme

Fuel injection spring

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