ASTM A29 8620 / 8620H is a low Nickel Chromium Molybdenum case hardening steel. Both 8620 vs 8620H belong to ASTM A29 standard.

Chemical composition 8620 vs 8620H

Standard Grade C Mn P S Si Ni Cr Mo
ASTM A29 8620 0.18-0.23 0.7-0.9 0.035 0.040 0.15-0.35 0.4-0.7 0.4-0.6 0.15-0.25
8620H 0.18-0.23 0.7-0.9 0.035 0.040 0.15-0.35 0.4-0.7 0.4-0.6 0.15-0.25

Property 8620 vs 8620H

As 8620 steel material could be case hardened, so the hardness could be different after hardening. AISI 8620 can be supplied in “H” condition with required hardenability. Strict analytical limits provide controlled response from heat to heat, making it an ideal selection for production case hardened parts, where consistency in heat treatment is required. AISI 8620 is usually further normalized or Quenching and Tempering and supplied as AISI 8620H.