Corrosion-proof castings

Conversion table of produced steels. We prefer to supply final product according to Chomutov marking. On special customer´s request is possible to supply castings according to other standard.

Marking of Chomutov	EU EN	WNr.	DE marked by DIN	FRA AFNOR	UK BSI	ITA UNI
ČSN 42 2905	GX12Cr12	1.4011	GX12Cr12	Z 12 C 13 M	420 C 29	GX12Cr13
ČSN 42 2906	-	1.4027	GX20Cr14	Z 22 C 13 M	420 C 29	GX30Cr13
ČSN 42 2931	GX5CrNi19 10	1.4308	GX5CrNi19 10	Z10CN 18.10 M	302 C 25	GX6CrNi20 10
ČSN 42 2942	GX5CrNiMo19 11 2	1.4408	GX6CrNiMo18 10	Z5CND 18.12 M	315 C 16	GX6CrNiMo20 11

Some types of castings are also roughted or machined according to our possibilities.

ČSN 42 2906 (Cr steel)

Chemical composition in percents

C	Mn	Si	P	S	P+S	Cr	Ni
0.15	max.	max.	max.	max.	max.	12.00	max.
0.30	0.70	0.70	0.04	0.04	0.07	14.00	1.00

Castings are delivered as normalized and tempered (+NT).

Mechanical properties and values

Tensile strength	Rm	N/mm2	588 - 785
Yield point Rp 0.2	Re	N/mm2	>=392
Elongation	A	%	>= 15
Contraction	Z	%	>= 30
Hardness	-	HB	175 - 235

• Corrosion Resistance
  The steel has a raised resistance to the effects of water and steam, diluted HNO3 and weak organic acids. It resists to corrosion better when hardened condition, but unfortunately is not delivered for production reasons.
• Weldability
  Good, conditional - preheating to 250-400°C with occasional reheating during welding according to the extent of the welding. Provide a slow cooling after welding. Subsequently it is necessary to anneal the castings at temperature of 700-720°C.
• Machinability
  Good
• Application
  For blades of water turbines, fittings, etc. The steel is applicable to various parts of industrial funaces, as a suspension for shaped brick lining, etc, where resistance to carburizing waste gases containing elemental sulphur up to 600°C is needed, with a higher content of Carbon up to 700°C. It is also applicable to the production of glass moulds.

ČSN 42 2931 (Cr-Ni steel)

Chemical composition in percents

C	Mn	Si	P	S	P+S	Cr	Ni
max.	max.	max.	max.	max.	max.	18.00	8.00
0.15	1.50	1.50	0.045	0.040	0.075	21.00	11.00

The castings are delivered as austenitized (+AT).

Mechanical properties and values

Tensile strength	Rm	N/mm2	>=441
Yield point Rp 0.2	Re	N/mm2	>=196
Elongation	A	%	>= 30
Contraction	Z	%	>= 40
Notch impact toughness KCU3	KC	J/cm2	>= 78
Hardness	-	HB	140 - 190

On agreement, it is possible to produce the steel with a lowered content of C (carbon).

• Corrosion Resistance
  Very good resistance to classical corrosion and acid HNO3, very diluted acid H2SO4, weak and diluted solutions of organic acids.
• Weldability
  Guaranteed - preheating is not necessary. Short interrupted weld beads are recommended, for reduced heat conductivity of steel. After welding a new austenization is necessary!
• Machinability
  Good
• Application
  Castings to be used in the chemical, food, cooking oil and paper industries, etc., with operation temperatures up to 400°C. The steel cannot be used as heat resistant regarding to its low carbon content.

ČSN 42 2942 (Cr-Ni-Mo steel)

Chemical composition in percents

C	Mn	Si	P	S	P+S	Cr	Ni	Mo
max.	max.	max.	max.	max.	max.	18.00	9.00	2.00
0.20	1.50	2.00	0.045	0.040	0.075	20.00	11.00	2.50

The castings are delivered as austenitized (+AT).

Mechanical properties and values

Tensile strength	Rm	N/mm2	>=441
Yield point Rp 0.2	Re	N/mm2	>=216
Elongation	A	%	>= 30
Contraction	Z	%	>= 35
Notch impact toughness KCU3	KC	J/cm2	>= 78
Hardness	-	HB	140 - 190

On agreement, it is possible to produce the steel with a lowered content of C (carbon).

• Corrosion Resistance
  Very good resistance to classical corrosion and acid HNO3, very diluted H2SO4 and to other unorganical and organic acids.
• Weldability
  Guaranteed - preheating is not necessary. Short interrupted weld beads are recommended, for reduced heat conductivity of steel. After welding a new austenization is necessary!
• Machinability
  Good. The cutting threads in slots by screwing taps made of tool and high-speed steel is more difficult.
• Application
  For fittings, pumps and other items for the chemical, fatty, food, paper, textiles and similar industries.
  For the production of cellulose, in textile dye works, etc., at operational temperatures up to 450°C. At lower content of C (Carbon) up to 500°C and contemporary increasing content of Mo. The steel cannot be used as heat-resistant.