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A BETTER PROPOSITION:
Contrary to the popular belief that 304 grade is better than J4 grade due to addition of Nickle, it is the addition of hardness which makes J4 grade more” scratch resistant and durable”.

WHAT IS DIFFERENCE BETWEEN 304 & J4 ?

The main difference between J4 & 304 is the difference in their chemistries, especially the percentage of Ni. 304 contains a minimum of 8% Ni and J4 has a minimum of only 1% Ni. The chromium content is also slightly lower, but as seen from the PRE, this is compensated to a large extent by increased nitrogen. Ni content in stainless steel is one of the most frequently discussed aspects when one talks of stainless steel. It is commonly believed that the corrosion resistance of stainless steel is from Ni and higher Ni content means better corrosion resistance. This is not true and the real contributor to the corrosion resistance of stainless steels is chromium. Ni does give added protection in chemical applications. But in a normal application, where stainless steel is exposed to an oxidizing atmosphere (as is the common case), corrosion resistance is from chromium and the PRE is a good indicator of corrosion resistance.

J4 is 50% stronger than 304

COMPARISON CHART

Grade

Ni %

Cr %

Ultimate Tensile Strength (Mpa)

Yield Strength

Hardness

Remarks

304

8 – 9 %

18%

520

205

8 – 10 HRC

Very Soft, Easily scratched, low life.

J4

1 – 1.5%

15%

650

325

18 – 22 HRC

Hard, not easily scratched, longer life

410 (Special grade for press plate)

0%

13%

1050

303

38 – 42 HRC

 European Make, higher hardness, Very High price

Grade 304 J4 410 (Special grade for press plate)
Ni % 8 – 9 % 1 – 1.5% 0%
Cr % 18% 15% 13%
Ultimate Tensile Strength (Mpa) 520 650 1050
Yield Strength 205 325 303
Hardness 8 – 10 HRC 18 – 22 HRC 38 – 42 HRC
Remarks Very Soft, Easily scratched, low life. Hard, not easily scratched, longer life European Make, higher hardness, Very High price

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