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Stainless Steel

API A1 — the standard corrosion-resistant ball and seat material.

Grade specifications

Ball Specifications

MaterialAISI Type 440 SS

Hardness52 – 56

Density.275 lbs/cu.in.

Chemical composition

C 0.86–1.20% / Cr 16.0–18.0% / Mn 1.0% max / Si 1.0% max / P .04% max / S .03% max / Ni 7.5% max / Mo 1.0% max

Remarks

Medium wear, mild corrosion resistance.

Seat Specifications

MaterialAISI Type 440 SS

Hardness52 – 56

Density.275 lbs/cu.in.

Chemical composition

C 0.86–1.20% / Cr 16.0–18.0% / Mn 1.0% max / Si 1.0% max / P .04% max / S .03% max / Ni 7.5% max / Mo 1.0% max

Remarks

Medium wear, mild corrosion resistance.

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