Metallurgical specifications of Tubes of Steel alloy 4130

General Characteristics
AISI/SAE 4130 Steel is a water-hardening alloy steel of low-to-intermediate hardenability. It retains good tensile, fatigue, and impact properties up to about 370 °C (700 °F); however, it has poor impact properties at cryogenic temperatures. This steel is not subject to temper embrittlement and can be nitrided. It is usually forged at 1100 to 1200 °C (2000 to 2200 °F); finishing temperature should never fall below 980 °C (1800 °F).

Available as billet, bar, rod, forgings, sheet, plate, tubing, and castings, 4130 steel is used to make automotive connecting rods, engine mounting lugs, shafts, fittings, bushings, gears, bolts, axles, gas cylinders, airframe components, hydraulic lines and nitrided machinery parts.
Typical Chemical Composition

Weight % C Mn Si Cr Ni Mo P S Fe

minimum 0.28 0.40 0.20 0.80 — 0.15 — — 97.03-98.22

maximum 0.33 0.60 0.35 1.10 — 0.25 0.035 0.040

Weight %	C	Mn	Si	Cr	Ni	Mo	P	S	Fe
minimum	0.28	0.40	0.20	0.80	—	0.15	—	—	97.03-98.22
maximum	0.33	0.60	0.35	1.10	—	0.25	0.035	0.040

Characteristics		English	Metric
Nominal density (68°F/20°C)		0.284 lbs/in³	7.85 g/cm³
Specific heat (212 °F/100°C)		0.114 BTU/lb – °F	477 J/KG- °K
Coefficient of thermal expansion	68°F – 212°F 20°C – 100°C	6.78 micro in/in- °F	12.2 micro m/m- °K
	68°F – 752°F 20°C – 400°C	7.61 micro in/in- °F	13.7 micro m/m- °K
	68°F – 1100°F 20°C – 600°C	8.11 micro in/in- °F	14.6 micro m/m- °K
Thermal conductivity	100°C	24.7 BTU/ft- hr – °F	42.7 W/m – °K
	300°C	23.5 BTU/ft- hr – °F	40.6 W/m – °K
	1200°C	17.4 BTU/ft- hr – °F	30.1 W/m – °K
Electrical properties	Electrical resistivity	20°C (68°F)	223 nΩ ∙ m
		100°C (212°F)	271 nΩ ∙ m
		400°C (752°F)	529 nΩ ∙ m
		1200°C (2190°F)	1222 nΩ ∙ m

Temper		Tensile					Modulus				Hardness
		Ultimate		Yield		Elongation at break	Of elasticity		Shear		Rockwell B
		KSI	MPa	KSI	MPa	%	KSIx10³	GPa	KSIx10³	GPa
Normalized at 870°C, air cooled	13 mm (0.5 in.) round	106	731	66.7	460	25.1	29.7	205	11.6	80	95
	25 mm (1 in.) round	97.2	670	63.1	435	25.5	29.7	205	11.6	80	92
	50 mm (2 in.) round	89.2	615	60.2	415	28.2	29.7	205	11.6	80	85
	100 mm (2 in.) round	89.2	615	58	400	27	29.7	205	11.6	80	84
Water quenched 855°C, 480°C temper	13 mm (0.5 in.) round	166	1145	161	1110	16.4	29.7	205	11.6	80	99
	25 mm (1 in.) round	161	1110	138	951	14.7	29.7	205	11.6	80	99
	50 mm (2 in.) round	133	917	110	758	19	29.7	205	11.6	80	99
	100 mm (2 in.) round	122	841	95	655	20.5	29.7	205	11.6	80	97
Water quenched 855°C, 540°C temper	13 mm (0.5 in.) round	151	1040	142	979	18.1	29.7	205	11.6	80	99
	25 mm (1 in.) round	144	993	130	896	18.5	29.7	205	11.6	80	99
	50 mm (2 in.) round	122	841	99.4	685	21.2	29.7	205	11.6	80	97
	100 mm (2 in.) round	116	800	92.1	635	21.5	29.7	205	11.6	80	97

Steel Alloy 4130 Sales:+972 4 618 2000

General Characteristics
AISI/SAE 4130 Steel is a water-hardening alloy steel of low-to-intermediate hardenability. It retains good tensile, fatigue, and impact properties up to about 370 °C (700 °F); however, it has poor impact properties at cryogenic temperatures. This steel is not subject to temper embrittlement and can be nitrided. It is usually forged at 1100 to 1200 °C (2000 to 2200 °F); finishing temperature should never fall below 980 °C (1800 °F).

Available as billet, bar, rod, forgings, sheet, plate, tubing, and castings, 4130 steel is used to make automotive connecting rods, engine mounting lugs, shafts, fittings, bushings, gears, bolts, axles, gas cylinders, airframe components, hydraulic lines and nitrided machinery parts.
Typical Chemical Composition

Weight % C Mn Si Cr Ni Mo P S Fe

minimum 0.28 0.40 0.20 0.80 — 0.15 — — 97.03-98.22

maximum 0.33 0.60 0.35 1.10 — 0.25 0.035 0.040

Weight %	C	Mn	Si	Cr	Ni	Mo	P	S	Fe
minimum	0.28	0.40	0.20	0.80	—	0.15	—	—	97.03-98.22
maximum	0.33	0.60	0.35	1.10	—	0.25	0.035	0.040

Characteristics		English	Metric
Nominal density (68°F/20°C)		0.284 lbs/in³	7.85 g/cm³
Specific heat (212 °F/100°C)		0.114 BTU/lb – °F	477 J/KG- °K
Coefficient of thermal expansion	68°F – 212°F 20°C – 100°C	6.78 micro in/in- °F	12.2 micro m/m- °K
	68°F – 752°F 20°C – 400°C	7.61 micro in/in- °F	13.7 micro m/m- °K
	68°F – 1100°F 20°C – 600°C	8.11 micro in/in- °F	14.6 micro m/m- °K
Thermal conductivity	100°C	24.7 BTU/ft- hr – °F	42.7 W/m – °K
	300°C	23.5 BTU/ft- hr – °F	40.6 W/m – °K
	1200°C	17.4 BTU/ft- hr – °F	30.1 W/m – °K
Electrical properties	Electrical resistivity	20°C (68°F)	223 nΩ ∙ m
		100°C (212°F)	271 nΩ ∙ m
		400°C (752°F)	529 nΩ ∙ m
		1200°C (2190°F)	1222 nΩ ∙ m

Temper		Tensile					Modulus				Hardness
		Ultimate		Yield		Elongation at break	Of elasticity		Shear		Rockwell B
		KSI	MPa	KSI	MPa	%	KSIx10³	GPa	KSIx10³	GPa
Normalized at 870°C, air cooled	13 mm (0.5 in.) round	106	731	66.7	460	25.1	29.7	205	11.6	80	95
	25 mm (1 in.) round	97.2	670	63.1	435	25.5	29.7	205	11.6	80	92
	50 mm (2 in.) round	89.2	615	60.2	415	28.2	29.7	205	11.6	80	85
	100 mm (2 in.) round	89.2	615	58	400	27	29.7	205	11.6	80	84
Water quenched 855°C, 480°C temper	13 mm (0.5 in.) round	166	1145	161	1110	16.4	29.7	205	11.6	80	99
	25 mm (1 in.) round	161	1110	138	951	14.7	29.7	205	11.6	80	99
	50 mm (2 in.) round	133	917	110	758	19	29.7	205	11.6	80	99
	100 mm (2 in.) round	122	841	95	655	20.5	29.7	205	11.6	80	97
Water quenched 855°C, 540°C temper	13 mm (0.5 in.) round	151	1040	142	979	18.1	29.7	205	11.6	80	99
	25 mm (1 in.) round	144	993	130	896	18.5	29.7	205	11.6	80	99
	50 mm (2 in.) round	122	841	99.4	685	21.2	29.7	205	11.6	80	97
	100 mm (2 in.) round	116	800	92.1	635	21.5	29.7	205	11.6	80	97

Steel Alloy 4130