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Last revised: Mon, 27 Nov 2023 15:18:57 GMT

C55

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General Information

C55 is a carbon steel for general purposes found in three variants in EN ISO 683-1.

510A is an ingot casted steel. High hardness (approx. 60HRC) and high strength can be achieved after hardening due to the relatively high carbon content. The steel is suitable for various type of applications where high strength is needed

056K is a low alloyed steel for quench and tempering. Used for machine parts etc. Can be induction or flame hardened

8665 is a continuous casted variant meeting all three of the EN ISO standards.

For additional Heat Treatment Data, please visit the Heat Treatment Guide.

Similar designations

C54, C55E - 1.1203, C55R - 1.1209, 070M55 (BS970), ASTM/SAE 1055, SS 1655, C55R, Cf53, 1.1213

Chemical composition

Variant	Cast	Weldability		C %	Si %	Mn %	P %	S %	Cr %	Ni %	Mo %	V %	DI %
510A	IC	CEV 0.86_max	Min	0.48	0.15	0.60	-	-	-	-	-	-	1.30
510A	IC	Pcm 0.66_max	Max	0.55	0.35	0.80	0.035	0.025	0.30	0.30	0.10	0.100	2.30
056K	IC	CEV 0.77_max	Min	0.52	0.20	0.50	-	0.015	0.15	-	-	-	-
056K	IC	Pcm 0.64_max	Max	0.56	0.30	0.60	0.025	0.025	0.25	0.25	0.06	-	-
8665	CC	CEV 0.71_max	Min	0.52	0.15	0.60	-	0.020	-	-	-	-	-
8665	CC	Pcm 0.6_max	Max	0.57	0.40	0.80	0.030	0.035	0.40	0.40	0.10	-	-
C55 EN ISO 683-1	Std	CEV 0.83_max	Min	0.52	0.10	0.60	-	-	-	-	-	-	-
C55 EN ISO 683-1	Std	Pcm 0.65_max	Max	0.60	0.40	0.90	0.045	0.045	0.40	0.40	0.10	-	-

Cr+Ni+Mo ≤ 0.63

Mechanical Properties

Variant	Condition	Format	Dimension [mm]	Yield strength min [MPa]	Tensile strength [MPa]	Elongation A₅ [%]	Reduction of area Z_min [%]	Hardness
Rp_0.2 * R_eh, ** R_el
510A	+QT	Round bar	25 < 40	420	700-850	15	40	-
056K	+QT	Round bar	15 < 40	520	800-950	13	30	-
8665	+AR	Round bar	16 < 25	-	-	-	-	220-257 HB
		Round bar	16 < 25	-	-	-	-	241 HB typical
		Round bar	26 < 85	-	-	-	-	220-250 HB
		Round bar	26 < 85	-	-	-	-	237 HB typical
		Flat bar	5 < 15	-	-	-	-	225-285 HB
		Flat bar	5 < 15	-	-	-	-	252 HB typical
		Flat bar	16 < 60	-	-	-	-	225-265 HB
		Flat bar	16 < 60	-	-	-	-	248 HB typical
C55 EN ISO 683-1	+QT	Round bar	< 16	550*	800-950	12	30	-
		Round bar	16.1 < 40	490*	750-900	14	35	-
		Round bar	40.1 < 100	420*	700-850	15	40	-
		Flat bar	< 8	550*	800-950	12	30	-
		Flat bar	8.1 < 20	490*	750-900	14	35	-

Transformation temperatures

	Temperature °C
MS	270
AC1	720
AC3	750

Heat treatment recommendations

Treatment	Condition	Temperature cycle	Cooling/quenching
Hot forging	+AR	850-1100°C	In air
Normalizing	+N	790-820°C	In still air
Soft annealing	+SA	680-710°C 2-4h, 15°C/h to 600°C	In still air
Hardening	+QT	790-820°C	In oil, temper immediately
Tempering	+QT	150-650°C 1h see tempering diagram	In still air

Data valid for Ovako 510A.

Heat Treatment Guide generated Graphs

The following graphs are generated from a theoretical model. For further info see the Heat treatment guide module. Select a specific grade version for individual display.

Hardenability

C55 ISO 683-1 shows the Jominy band for C55E/C55R +H

510A

Steel cleanliness

Micro inclusions - 510A									Macro inclusions - 510A
Applied standard	ASTM E45								Applied standard	ISO 3763 (Blue fracture)
Sampling	ASTM A295								Sampling	Statistical testing on billets
Maximum average limits	A		B		C		D		Limits	< 5 mm/dm²
	Th	He	Th	He	Th	He	Th	He
	2.5	1.5	1.5	0.5	0	0	1.0	0.5

SUSTAINABILITY-ENVIRONMENTAL IMPACT DATA

At Ovako sustainability and reduction of our environmental impact is a major focus in everything we do.
Further information is found here.

In many international comparisons the crude steel Scope 1-2 emission is a key parameter, ie. the CO₂ emission from the steel works itself.
As of 1 January 2022 we carbon offset all our scope 1 and 2 volume shown below.

Steel works	Hofors	Smedjebacken	Imatra
CO2e/kg	120	62	76

To get the full picture of our products environmental impact we have to look at all of our CO₂ emission sources.
Not only the steel work Scope 1-2 itself, but all operations downstream in our production, heating and heat treatment furnaces etc (full scope 1-2) as well as all the emission from input material, eg. alloys, scope 3.

Steel Grade	Format	Condition	Scope 1-3 (CO2e kg /1000 kg steel)	Climate compensated Net emission = Scope 3 (CO2e kg /1000 kg steel) Scope 1 - 2 = 0 (compensated)
510A	Round bar	+AR	582	186
510A	Round bar	+QT	592	187
510A	Tube,wall	+AR	597	194
510A	Tube,wall	+QT	607	195
056K	Round bar	+AR	578	182
056K	Round bar	+QT	589	183
056K	Tube,wall	+AR	593	190
056K	Tube,wall	+QT	603	191
SBC55	Flat bar	+AR	550	183

As of 1 January 2022 we use carbon offset for all our scope 1- 2 emissions, so in practice the climate compensated data is the same as the full Scope 3 level.
All above data are to be seen as typical values for the specified format and condition. Detailed information about your specific product please contact your sales contact.

Other properties (typical values)

Youngs module (GPa)	Poisson´s ratio (-)	Shear module (GPa)	Density (kg/m3)
210	0.3	80	7800
Average CTE 20-300°C (µm/m°K)	Specific heat capacity 50/100°C (J/kg°K)	Thermal conductivity Ambient temperature (W/m°K)	Electrical resistivityAmbient temperature (µΩm)
12	460 - 480	40 - 45	0.20 - 0.25

Contact us

Would you like to know more about our offers? Don´t hesitate to contact us:

Via e-mail: info@ovako.com

Via telephone: +46 8 622 1300

For more detailed information please visit http://www.ovako.com/en/Contact-Ovako/

Disclaimer

The information in this document is for illustrative purposes only. The data and examples are only general recommendations and not a warranty or a guarantee. The suitability of a product for a specific application can be confirmed only by Ovako once given the actual conditions.The purchaser of an Ovako product has the responsibility to ascertain and control the applicability of the products before using them. Continuous development may necessitate changes in technical data without notice. This document is only valid for Ovako material. Other material, covering the same international specifications, does not necessarily comply with the properties presented in this document.

General information
Chemical composition
Mechanical properties
Transformation temp.
Heat treatment
HTG Graphs
Hardenability
Sustainability