BS 1452 1990 for Gray Iron Castings

A source of confusion is the large number of production standards that have grown up across the world to enable buyers to specify a particular grade. To take the UK as an example one of the earlier standards used was BS 1452. Within this standard the grades were specified by tensile strength in tons/in². This was changed to N/mm² as the UK went through metrification and the tensile strengths were adjusted slightly to fall in line with their European equivalents.

Grade	Wall Thickness of Casting /mm	Tensile Strength σb≥/Mpa
Grade	Wall Thickness of Casting /mm	Test Bar with Casting	Casting
100	2.5~10 10~20	— —	120 90
150	2.5~10 10~20 20~40 40~80 80~150 150~300	— — 120 110 100 90	155 130 110 95 80 —
180	2.5~10 10~20 20~40 40~80 80~150 150~300	— — 150 135 125 100	185 160 135 115 100 —
200	2.5~10 10~20 20~40 40~80 80~150 150~300	— — 170 150 140 130	205 180 155 130 115 —
220	2.5~10 10~20 20~40 40~80 80~150 150~300	— — 175 165 150 140	220 195 170 145 130 —
250	5~10 10~20 20~40 40~80 80~150 150~300	— — 210 190 170 160	250 225 195 170 155 —
300	10~20 20~40 40~80 80~150 150~300	— 250 220 210 190	270 240 210 195 —
350	10~20 20~40 40~80 80~150 150~300	— 290 260 230 210	315 280 250 225 —