Two: chemical composition

c:≤0.07 Si:≤ 1.00 Mn:≤ 1.00S:≤0.030 P:≤0.035。

Cr: 15.50 ~ 17.50 Ni: 3.00 ~ 5.00 Cu: 3.00 ~ 5.00 Nb: 0. 15 ~ 0.45.

Three. Scope of application Application field:

It is suitable for manufacturing equipment parts that require good corrosion resistance and high strength. Such as engine parts, pump shafts, gears, piston columns and fasteners with special requirements.

mechanical character

Tensile strength σ b (MPa): aged at 480℃, ≥1310; Aging at 550℃, ≥1060; Aging at 580℃, ≥1000; Aging at 620℃, ≥930, conditional yield strength σ 0.2 (MPa): aging at 480℃, ≥1180; Aging at 550℃, ≥1000; Aging at 580℃, ≥ 865; Aging at 620℃, ≥725, elongation δ 5 (%): aging at 480℃, ≥10; Aging at 550℃, ≥12; Aging at 580℃, ≥13; Aging at 620℃, ≥ 16, area shrinkage ψ (%): aging at 480℃, ≥ 40; Aging at 550℃, ≥ 45; Aging at 580℃, ≥ 45; Aging at 620℃, ≥50

Hardness: solid solution, ≤363HB and ≤ 38 HRC; Aging at 480℃, ≥375HB and ≥ 40 hours RC; Aging at 550℃, ≥33 1HB and ≥ 35 HRC; Aging at 580℃, ≥302HB and ≥3 1HRC; Aging at 620℃, ≥277HB and ≥28HRC.

IV: Overview

It is a martensitic precipitation hardening stainless steel material. In addition to martensitic transformation, it can be further strengthened by aging, and its corrosion resistance and weldability are better than those of ordinary martensitic steel and similar to those of 18-8 austenitic steel.