Specification of materials

The correct choice of the material is a main criteria for the efficiency of the kiln. Especially important for the selection of the materials are: Temperature, type of firing and type of gases. All given analysis correspond to DIN. There can be deviations in the chains we deliver.

Carbon and alloy steels
For the section below 500°C. In case of higher wear, alloy steels are recommended. These steels can be heat treated in order to obtain a harder surface and therefore, lower wear.

Ferritic steels
These steels fit best to sulphurous gases, but do not suit for nitriding and for carburizing conditions.

Austenitic steels
They are most suitable to carburizing conditions, but unsuitable for gases with more than 1% sulphur.

Austenitic-manganese steels
Combines the advantages of the both mentioned steels, these steels are suitable for sulphur containing gases with carburizing conditions.

Material Number	Symbol	US Standard	C	Si	Mn	< P	< S	Cr	Ni	Al
Carbon steels
1.0035*	St 33	C 1008	= 0,30	= 0,30	0,20 - 0,50	0,060	0,050	-	-	-
1.0207	St 35 - 2	C 1010	0,06 - 0,14	traces	0,40 - 0,60	0,035	0,035	-	-	-	1)
1.0402	C 22	C 1020	0,17 - 0,24	= 0,40	0,40 - 0,70	0,045	0,045	= 0,40	= 0,40	-	2)
1.0495	21 Mn 5	C 1022	0,18 - 0,24	= 0,25	1,10 - 1,60	0,035	0,035	-	-	0,02 - 0,05	1)
1.0570	St 52 - 3	C 1024	= 0,20	= 0,55	= 1,60	0,035	0,035	-	-	-
1.0501	C 35	C 1035	0,32 - 0,39	= 0,40	0,50 - 0,80	0,045	0,045	= 0,40	= 0,40	-	3)
Alloy steels
1.7225	42 Cr Mo 4	SAE 4140	0,38 - 0,45	= 0,40	0,60 - 0,90	0,035	0,035	0,90 - 1,20	-	-	4)
1.6523	20 Ni Cr Mo2 - 2	SAE 8620	0,17 - 0,23	= 0,40	0,65 - 0,90	0,035	0,035	0,35 - 0,70	0,40 - 0,70	-	5)
Ferritic steels
1.4713	X 10 Cr Al 7	8 F	= 0,12	0,5 - 1,0	= 1,0	0,040	0,015	6,0 - 8,0	-	0,50 - 1,00
1.4724	X 10 Cr Al 13	9 F	= 0,12	0,7 - 1,4	= 1,0	0,040	0,015	12,0 - 14,0	-	0,70 - 1,20
1.4742	X 10 Cr Al 18	10 F	= 0,12	0,7 - 1,4	= 1,0	0,040	0,015	17,0 - 19,0	-	0,70 - 1,20
Austenitic steels
1.4301	X 5 Cr Ni 18 10	304	= 0,07	= 1,0	= 2,0	0,045	0,015	17,0 - 19,5	8,0 - 10,5	-	6)
1.4821	X 15 Cr Ni Si 25 4	329	0,10 - 0,20	0,8 - 1,5	= 2,0	0,040	0,015	24,0 - 26,5	3,5 - 5,5	-	6)
1.4828	X 15 Cr Ni Si 20 12	309	= 0,20	1,5 - 2,5	= 2,0	0,045	0,015	19,0 - 21,0	11,0 - 13,0	-	6)
1.4841	X 15 Cr Ni Si 25 20	310	= 0,20	1,5 - 2,5	= 2,0	0,045	0,015	24,0 - 26,0	19,0 - 22,0	-	6)
1.4541	X 6 Cr Ni Ti 18 10	321	= 0,08	= 1,0	= 2,0	0,045	0,015	17,0 - 19,0	9,0 - 12,0	-
Austenitic manganese steels
85 MA	-	-	0,2 - 0,3	= 1,0	7,0 - 9,0	0,045	0,015	16,0 - 18,0	3,5 - 4,5	-	7)
105 MA**	-	-	0,2 - 0,3	= 1,0	8,0 - 10,0	0,045	0,015	19,0 - 21,0	3,5 - 4,5	-
115 MA	-	-	0,2 - 0,3	= 1,0	8,0 - 10,0	0,045	0,015	24,0 - 26,0	5,0 - 7,0	-

* No analysis given in DIN, values are recommended values only.
** Material 100 MA is replaced by material 105 MA.

1) Cu = 0,25; N = 0,012
2) Mo = 0,10; Ni = 0,40; (Cr+Mo+Ni) = 0,63
3) Mo = 0,10
4) Mo 0,15 - 0,30
5) Mo 0,15 - 0,25
6) N = 0,11
7) N 0,25 - 0,36

Material Number	Scale resisting up to (gas temperature) °C	Scale resisting up to (gas temperature) F	Recommended temp. (gas temperature) °C	Recommended temp. (gas temperature) F	Firing Oil	Firing Gas	Firing Carbon
Carbon steels
1.0035*	500	932	= 500	= 932	•	•	•
1.0207	500	932	= 500	= 932	•	•	•
1.0402	500	932	= 500	= 932	•	•	•
1.0495	500	932	= 500	= 932	•	•	•
1.0570	500	932	= 500	= 932	•	•	•
1.0501	500	932	= 500	= 932	•	•	•
Alloy steels
1.7225	550	1.022	= 550	= 1.022	•	•	•
1.6523	550	1.022	= 550	= 1.022	•	•	•
Ferritic steels
1.4713	850	1.562	500 - 800	932 - 1.472	•	•
1.4724	950	1.742	500 - 900	932 - 1.652	•	•
1.4742	1.100	2.012	800 - 1.050	1.472 - 1.922	•	•
Austenitic steels
1.4301	850	1.562	500 - 850	932 - 1.562		•	•
1.4821	1.100	2.012	800 - 1.100	1.472 - 2.012		•	•
1.4828	1.050	1.922	800 - 1.050	1.472 - 1.922		•	•
1.4841	1.200	2.192	850 - 1.200	1.562 - 2.192		•	•
1.4541	850	1.562	500 - 850	932 - 1.562		•	•
Austenitic manganese steels
85 MA	850	1.562	500 - 850	932 - 1.562	•	•	•
105 MA**	1.000	2.012	700 - 950	1.292 - 1.742	•	•	•
115 MA	1.200	2.192	850 - 1.200	1.562 - 2.192	•	•	•

Material Number	Structure	Sigma phase brittleness	Suitable for carburizing conditions	Suitable for sulphur containing gases	Surface hardness HV heat treatment without	Surface hardness HV heat treatment with
Carbon steels
1.0035*	ferrite/perlite	no	•	•	180	250
1.0207	ferrite/perlite	no	•	•	180	250
1.0402	ferrite/perlite	no	•	•	200	250
1.0495	ferrite/perlite	no	•	•	230	400
1.0570	ferrite/perlite	no	•	•	230	400
1.0501	ferrite/perlite	no	•	•	230	600
Alloy steels
1.7225	ferrite/perlite	no	•	•	250	450
1.6523	ferrite/perlite	no	•	•	250	450
Ferritic steels
1.4713	ferrite	no		•
1.4724	ferrite	no		•
1.4742	ferrite	= 800°C		•
Austenitic steels
1.4301	austenite	no	•
1.4821	austenite	no	•
1.4828	austenite	no	•
1.4841	austenite	no	•
1.4541	austenite	no	•
Austenitic manganese steels
85 MA	aust./manganese	no	•	•
105 MA**	aust./manganese	= 650°C	•	•
115 MA	aust./manganese	= 750°C	•	•

Specification of materials

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