Under rice wheat or rice oilseed rape cropping system, seven oilseed rape cultivars and two wheat cultivars were used to study the difference of oilseed rape and wheat in tolerance to Mn deficiency.

The excellent fine primary structure with less defects and lower composition segre- gation is obtained through modification for medium-manganese wear-resistant steel , then high im- pact toughness and wear-resistance is obtained by quenching from as-cast and obvious comprehen- sive techno-economic effect is gained with energy saving.