機器
alloy
ball
balls
bearing
belt
billet
billets
blast
cast
casting
circle
conveyor
elevator
equipment
factory
fire
flame
forging
foundry
furnace
globe
grinding
heat
heavy
high temperature
hot
industrial
industry
ingot
iron
line
machinery
manufacture
manufacturing
material
mechanism
melt
melting
metal
metallurgical
metallurgy
mill
molten
orange
plant
process
production
profile
red
rollers
rolling
slab
smelting
spark
sphere
steel
stove
workshop