This standard is applicable to sand-casting grey iron castings or grey iron castings whose thermal conduction is equivalent to sand-casting grey iron castings. This standard can also be referred by grey iron castings of other molds.

GB9439-88 Gray Iron Castings Mechanical Properties Form

Number	Tensile strength for reference			mechanical properties of attached test coupon (block)
	wall thickness of casting/mm		Tensile strength σb≥/Mpa	wall thickness of casting / Mm		Tensile strength σb≥/Mpa
	≥	≤		≥	≤	attached test coupon		attached to test block casting		Castings (reference)
						Ø30mm	Ø50mm	R15mm	R25mm
HT100	2.5	10	130
	10	20	100
	20	30	90
	30	50	80
HT150	2.5	10	175	20	40	130	120	120		165
	10	20	145	40	80	115	115	110		105
	20	30	130	80	150		105		100	90
	30	50	120	150	300		100		90	80
HT200	2.5	10	220	20	40	180	155	170		165
	10	20	195	40	80	160	155	150		145
	20	30	170	80	150		145		140	130
	30	50	160	150	300		135		130	120
HT250	4.0	10	270	20	40	220		210		205
	10	20	240	40	80	200	190	190		180
	20	30	220	80	150		180		170	165
	30	50	200	150	300		165		160	150
HT300	10	20	290	20	40	260		250		245
	20	30	250	40	80	235	230	225		215
	30	50	230	80	150		210		200	195
				150	300		195		185	180
HT350	10	20	290	20	40	300		290		285
	20	30	250	40	80	270	265	260		255
	30	50	230	80	150		240		230	225
				150	300		215		210	205

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