Chinese made high carbon chrome steel 3Cr14 is developed based on 420J2.
Chemical composition:
Carbon: 0.30- 0.35 %
Silicon: 1.00 %
Manganese: 1.00 %
Phosphorus: 0.035 %
Sulfur: 0.030 %
Chromium: 13.20- 13.50 %
Iron: Balance
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a tin plate is tin and a plate, and stainless steel is stainless steel.
It's a misnomer. 4140 is a type of steel, which is NOT stainless.
Stainless steel was invented in Sheffield
Easy. A rod or electrode used in welding stainless steel. Or to "clad" a surface with stainless steel. (Nothing more than laying down a layer or layers of stainless.) MIG wire also comes in stainless steel. Their are different types of stainless steel and rods/wire/electrodes to use on them.
Per the attached related link, the density (hence weight) of stainless is slightly more than the mild carbon steel. Using about 8.03/7.84 ratio of density, for the same volume of material the stainless will weigh 2.4 % more.