ISO 185 - Dandong Foundry

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ISO 185 : 1988 for Gray Cast Iron

ISO 185 is a standard for gray cast iron. It includes the tensile strength and hardness of gray iron. This standard can be a good reference for designers, buyers and suppliers to gray iron castings.

The grade of gray cast iron and the tensile strength of Cast integral test bar and castings

Grade	Tensile strength of Cast integral test bar σ_b≥/Mpa	Castings
Grade	Tensile strength of Cast integral test bar σ_b≥/Mpa	Thickness /mm	Tensile strength σ_b≥/Mpa
100	100	＞2.5~10 ＞10~20	120 90
150	150	＞2.5~10 ＞10~20 ＞20~30 ＞30~50	155 130 115 105
200	200	＞2.5~10 ＞10~20 ＞20~30 ＞30~50	205 180 160 145
250	250	＞4.0~10 ＞10~20 ＞20~30 ＞30~50	250 225 205 185
300	300	＞10~20 ＞20~30 ＞30~50	270 245 225
350	350	＞10~20 ＞20~30 ＞30~50	315 290 270

Tensile strength of test bar made from attached specimen of gray cast iron

Grade	Thickness of cross section of castings /mm		Tensile strength σ_b≥/Mpa
	＞	≤	Attached specimen		On castings （parameter）
	＞		φ30mm	φ50mm	On castings （parameter）
100	—	—	—	—	—
150	20 40 80 150	40 80 150 300	120 110	100 90	110 95 80 —
200	20 40 80 150	40 80 150 300	170 150	140 130	155 130 115 —
250	20 40 80 150	40 80 150 300	210 190	170 160	195 170 155 —
300	20 40 80 150	40 80 150 300	250 220	210 190	240 210 195 —
350	20 40 80 150	40 80 150 300	290 260	230 210	280 250 225 —

Hardness range of gray cast iron

Hardness grade	Hardness range on castings HBS
H145 H175 H195 H215 H235 H255	≤170 150~200 170~220 190~240 210~260 230~280

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