Material GX40CrNiSi25-12 (1.4837 / 1.4835)

Robust and reliable – even at extreme temperatures

When extreme conditions place heavy demands on your materials, GX40CrNiSi25-12 (1.4837, comparable in analysis to 1.4835) is the answer. This heat-resistant cast steel offers an exceptional combination of strength, corrosion resistance and creep resistance. It is ideal for use in high-temperature environments and aggressive atmospheres at continuous operating temperatures of 1,150°C and peak temperatures of up to 1,200°C, where other materials would fail. As a result, this material is used in particular in furnace construction, for burner components or exhaust systems.

Material designations and standards

Material number:

1.4840

Standard designation (EN):

GX40CrNiSi25-12

Standards:

EN 10295 (Heat-resistant cast steels)

AISI/SAE:

309

Similar materials:

1.4848 (GX40CrNiSi25-20, higher temperature resistance)

Specifications and details

Material name & material no.	Comparable materials or standards					Main elements of material analysis (mass fraction in %)										Physical and mechanical properties								General heat treatment, unless otherwise agreed
acc. to DIN EN 10293	acc. to	acc. to ASTM	acc. to SAE/AISI	acc. to JIS	acc. to China	C	Si	Mn	Cr	Mo	Ni	N	Cu	Nb	Other elements	Density in kg/dm3	Type of heat treatment	Rp0.2 min	Rm min	Hardness values in HB (approx.)	A % min	KV2 J min	Temperature °C
GS200 & 1.0449	DIN EN 10340 or SEL	A 216 Grade WCA		SC360	ZG200-400	≤ 0,18	≤ 0,60	≤ 1,20	_	_	_	_	_	_	_	_	+N	200	380 - 530	110 - 155	25	35	RT	Normalizing
GS240 & 1.0455	DIN EN 10340 or SEL	A 414 Grade F A 445	1012	SB450 SB480	_	≤ 0,23	≤ 0,60	≤ 1,20	_	_	_	_	_	_	_	_	+N	240	450 - 600	130 - 180	22	31	RT	Normalizing
G20Mn5 & 1.6220	DIN EN 10213, DIN EN 10340 or SEL	A 352 Grade LCC	_	SCC 3 SCPH 11-CF	ZG300-500	0,17 - 0,23	≤ 0,60	1,00 -1,60	_	_	≤ 0,80	_	_	_	_	7,8	+N \| +QT	300 \| 300	480 - 620 \| 500 - 650	140 - 185 \| 150 - 190	20 \| 22	27 \| 50 \| 27 \| 60	-30 \| RT \| -40 \| RT	Normalizing \| Quenched and tempered
G24Mn6 & 1.1118	DIN EN 10213, DIN EN 10340 or SEL	_	_	_	_	0,20 - 0,25	≤ 0,60	1,50 - 1,80	_	_	_	_	_	_	_	7,8	+QT1 \| +QT2 \| +QT3	550 \| 500 \| 400	700 - 800 \| 650 - 800 \| 600 - 800	210 - 240 \| 190 - 240 \| 180 - 240	12 \| 15 \| 18	27 \| 27 \| 27	-20 \| -30 \| -30	Quenched and tempered
G20Mo5 & 1.5419	DIN EN 10213 or SEL	A 217 Grade WC1 A 217 J12524	4422	SCPH 11 SCPL 11	ZG19MoG	0,15 - 0,23	≤ 0,60	0,50 - 1,00	_	0,40 - 0,60	_	_	_	_	_	7,85	+QT	245	440 - 590	130 - 175	22	27	RT	Quenched and tempered
G15CrMoV6-9 & 1.7710	1.7711 acc. to DIN EN 10269 or SEL	_	_	_	_	0,12 - 0,18	≤ 0,60	0,60 - 1,00	1,30 - 1,80	0,80 - 1,00	_	_	_	_	V 0,15 - 0,25	7,85	+QT1 \| +QT2	700 \| 930	850 - 1000 \| 980 - 1150	250 - 300 \| 290 - 340	10 \| 6	27	RT	Quenched and tempered
G17CrMo9-10 & 1.7379	DIN EN 10213 or SEL	A 217 Grade WC9 A 487 Grade 8 Class A	4118	SCPH 32-CF	ZG17Cr2Mo1 ZG12Cr2Mo1G	0,13 - 0,20	≤ 0,60	0,50 - 0,90	2,00 - 2,50	0,90 - 1,20	_	_	_	_	_	7,85	+QT	400	590 - 740	175 - 220	18	40	RT	Quenched and tempered
G26CrMo4 & 1.7221	SEW 658 or SEL	A 148 Grade 105-85	4118	SCCrM 1	25CrMo	0,22 - 0,29	≤ 0,60	0,50 - 0,80	0,08 - 1,20	0,15 - 0,30	_	_	_	_	_	7,85	+QT1 \| +QT2	300 - 450 \| 550	550 - 750 \| 700 - 850	160 - 220 \| 210 - 250	14 - 16 \| 10	27 - 40 \| 18	RT	Quenched and tempered
G42CrMo4 & 1.7231	1.7225 acc. to DIN EN 10250	_	4140 4142	SCM440	42Cr1Mo 40CrMnMo	0,38 - 0,45	≤ 0,60	0,60 - 1,00	0,08 - 1,20	0,15 - 0,30	_	_	_	_	_	7,85	+QT1 \| +QT2	350 - 600 \| 700	650 - 950 \| 850 - 1000	190 - 280 \| 250 - 300	10 - 12 \| 10	16 - 31 \| 27	RT	Quenched and tempered
G35CrNiMo6-6 & 1.6579	_	_	4337 4330	SNCM447	_	0,32 - 0,38	≤ 0,60	0,60 - 1,00	1,40 -1,70	0,15 - 0,35	1,40 - 1,70	_	_	_	_	_	+N \| +QT1 \| +QT2	500 - 550 \| 650 - 700 \| 800	750 - 950 \| 800 - 1000 \| 900 - 1050	220 - 280 \| 240 - 300 \| 265 - 310	12 \| 12 \| 10	31 \| 30 - 45 \| 35	RT	Annealed \| Quenched and tempered
GX9Ni5 & 1.5681	_	_	_	_	_	0,06 - 0,12	≤ 0,60	0,50 - 0,80	_	_	4,50 - 5,50	_	_	_	_		+QT	380	550 - 700	160 - 210	18	100	RT	Quenched and tempered
G17NiCrMo13-6 & 1.6781	DIN EN 10213 or SEW520	A 352 Grade LC2-1 A 352 J42215	_	_	ZG17Ni3Cr2Mo	0,15 - 0,19	≤ 0,50	0,55 - 0,80	1,30 - 1,80	0,45 - 0,60	3,00 - 3,50	_	_	_	_	7,85	+QT	600	750 - 900	220 - 265	15	27	-80	Quenched and tempered
GX3CrNi3-4 & 1.6982	DIN EN 10213 or SEL	A 217 Grade CA15 A 743 J91540		SCS 1	ZG05Cr13Ni4Mo	≤ 0,05	≤ 1,00	≤ 1,00	12,00 - 13,00	≤ 0,70	3,50 - 5,00	_	_	_	_	7,7	+QT	500	700 - 900	210 - 265	15	27	120	Quenched and tempered

Die Vorteile von GX40CrNiSi25-12 (SAE/AISI 309)

Excellent oxidation resistance – suitable for temperatures up to approx. 1,150°C

High mechanical strength – suitable for heavily loaded components

Good scaling resistance – long service life in high-temperature applications

Good corrosion resistance – especially in oxidising atmospheres

Good castability – ideal for complex cast parts

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Areas of application

Furnace construction

Chemical and process industry

Automotive industry

Power plant construction

Chemical composition and mechanical properties.

C (Kohlenstoff):

≤ 0,20 %

Si (Silizium):

1,50 - 2,50 %

Mn (Mangan):

≤ 2,00 %

P (Phosphor):

≤ 0,04 %

S (Schwefel):

≤ 0,03 %

Cr (Chrom):

24,0 - 26,0%

Ni (Nickel):

11,0 - 13,0 %

Tensile strength (Rm):

≥ 500 MPa

Yield strength (Rp0.2):

≥ 250 MPa

Elongation at break (A5):

≥ 20 %

Hardness (HB):

≤ 230 HB

Solution annealing:

1050 - 1150 °C, followed by slow cooling to reduce stress

Stress relief annealing:

200 - 300 °C to minimise internal stresses

Oxidation and scaling resistance:

Even at fluctuating temperatures, thanks to the high chromium, nickel, silicon and cerium content (cerium = rare earth metal used to improve the oxide layer).

GX40CrNiSi25-12 properties at a glance

Special feature

GX40CrNiSi25-12 is resistant to oxidation and scaling at high temperatures.

Versatility

The material is resistant to many corrosive media, especially at high temperatures.

Resistance

The steel retains its strength even at high temperatures and can therefore bear loads even under the influence of heat.

Warum GX40CrNiSi25-12?

Cost-effectiveness
Thanks to their high load-bearing capacity, components made from GX25CrNiSi20-14 have a long service life and reduced maintenance costs.

Processing
The steel can be readily welded or cast into complex shapes.

Areas of use
The material is often used in furnace construction, burner components or exhaust systems.