JMn97: Mn:97%min C:0.05%max Si:0.4%max
Fe:2.0%max P:0.03%max S:0.04%max
10-50mm:90%min
JMn95: Mn:95%min C:0.06%maxSi:0.5%max
Fe:3.0%max P:0.04%max S:0.05%max