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DIN 1692-82 for malleable cast iron

The types of malleable cast iron include black coring and white coring malleable cast iron. White coring malleable cast iron has higher toughness by the decarburization annealing process, and black coring has not decarburization annealing process.

The mechanical property of malleable cast iron is higher than grey cast iron. They are used for impact resistance and vibration resistance of the parts, such as the car of steering mechanism, piston, wheel gear, low pressure valve, pipe joint, and so on.

The following is the grade and mechanical properties of malleable cast iron provided by Dandong Foundry in China for your reference.

Table 1 Grade and mechanical properties of black coring malleable cast iron without decarburization and anneal

Grade		Material No W-Nr.	Specimen diameter /mm	Tensile strength σ_b≥ /Mpa	Yield strength σ_0.2≥ /Mpa	Elongation δ≥（％）	Hardness ≤ HBS	Microstructure
New grade	Old grade	Material No W-Nr.	Specimen diameter /mm	Tensile strength σ_b≥ /Mpa	Yield strength σ_0.2≥ /Mpa	Elongation δ≥（％）	Hardness ≤ HBS	Microstructure
GTS-35-10	GTS-35	0.8135	12 or 15	350	200	10	≤150	ferrite + annealing carbides
GTS-45-06	GTS-45	0.8145	12 or 15	450	270	6	150~200	pearlite (from flake to granular) + ferrite + annealing carbides
GTS-55-04	GTS-55 GTS-65	0.8155	12 or 15	550	340	4	180~230	pearlite (from flake to granular) + annealing carbides, part of ferrite
GTS-65-02 GTS-70-02	GTS-70	0.8165 0.8170	12 or 15 12 or 15	650 700	430 530	2 2	210~260 240~290	pearlite (from flake to granular) + (acinose sorbite) + annealing carbides

Table 2 Grade and mechanical properties of white coring malleable cast iron with decarburization and anneal

Grade		Material No W-Nr.	Specimen diameter /mm	Tensile strength σb≥/Mpa	Yield strength σ0.2≥/Mpa	Elongation δ≥（％）	Hardness ≤ HBS	Microstructure
New grade	Old grade	Material No W-Nr.	Specimen diameter /mm	Tensile strength σb≥/Mpa	Yield strength σ0.2≥/Mpa	Elongation δ≥（％）	Hardness ≤ HBS	Microstructure
GTW-35-04	GTW-35	0.8035	9 12 15	340 350 360	- - -	5 4 3	230 230 230	the range that wider than GTW-40 is allowed
GTW-40-05	GTW-40	0.8040	9 12 15	360 400 420	200 220 230	8 5 4	220 220 220	core part: (from flake to granular) pearlite + annealing carbides
GTW-45-07	GTW-45	0.8045	9 12 15	400 150 480	230 260 280	10 7 4	220 220 220	core part: (flake) pearlite + annealing carbides
GTW-S38-12	GTW-S38	0.8038	9 12 15	320 380 400	170 200 210	15 12 8	200 200 200	decarburization in the condition of Thickness < 8mm CR ≤ 0.3%

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