SUS 631、W.Nr.1.4568、301S81

SUS 631 (S17700, 17-7PH, W.Nr. 1.4568) precipitation hardening stainless steel overview:

17-7PH is an austenite-martensitic precipitation-hardening stainless steel developed on the basis of 18-8CrNi, also known as controlled phase change stainless steel. After solution treatment, it is an unstable austenite structure with good plastic toughness and workability. After adjustment, the austenite precipitated carbide composition changes, and after martensite transformation treatment, most of the structure is transformed into toughness. Good low carbon tempered martensite, this state is the state of use of steel, and has good mechanical properties at medium temperature. Corrosion resistance is better than general martensitic stainless steel.

 

Chemical composition of SUS 631 (S17700, 17-7PH, W.Nr. 1.4568) precipitation hardening stainless steel:

C≤	Si≤	Mn≤	P≤	S≤	Ni	Cr	Al
0.09	1.00	1.00	0.04	0.030	6.50 7.75	16.00 18.00	0.75 1.50

 

SUS 631 (S17700, 17-7PH, W.Nr. 1.4568) precipitation hardening stainless steel mechanical properties:

Density	7.75 g/cm3
Melting point	1404-1440℃
Specific heat capacity	460.6J/（kg·℃）
Magnetic	yes

 

SUS 631 (S17700, 17-7PH, W.Nr. 1.4568) precipitation hardening stainless steel

1. Hot working: The maximum heating temperature is 1150 ℃, the forging (rolling) temperature is about 1100 ℃, the termination temperature should not be lower than 950 ℃, and air cooling after forging and rolling.

2. Cold working: Cold working hardening tends to be large. In cold rolling, cold drawing or stamping, it is advisable to use a small number of passes and a large number of reductions and multiple intermediate solution treatment methods. Cold processed products should be treated in a protective atmosphere.

 

SUS 631 (S17700, 17-7PH, W.Nr. 1.4568) precipitation hardening stainless steel

17-7PH precipitation hardened steel is widely used in offshore platforms, helicopter decks, other platforms, food industry, pulp and paper industry, aerospace (turbine blades), mechanical parts, nuclear waste barrels, medical equipment due to its excellent strength and corrosion performance. .