7Cr17、68Cr17

● Characteristics and scope of application:

7Cr17 stainless steel is hard in the hardened state, but has higher toughness than 8Cr17 and 11Cr17. Used as cutting tools, measuring tools, bearings. 7CR17 stainless steel has higher strength resistance to nitric acid and organic acid corrosion parts. Cellar and equipment

 

● Chemical composition:

Steel number	C≤	Si≤	Mn≤	S≤	P≤	Cr	Ni≤	Mo≤
7CR17	0.60 075	1.00	1.00	0.030	0.040	16.00 18.00	0.60	0.75

 

● Mechanical properties:

Hardness: annealing, ≤ 255HB; quenching and tempering, ≥ 54HRC

 

● Heat treatment specifications and metallographic structure:

Heat treatment specifications: 1) annealing, slow cooling at 800 ～ 920 ℃; 2) quenching, oil cooling at 1010 ～ 1070 ℃; 3) tempering, rapid cooling at 100 ～ 180 ℃.

Metallographic structure: the organization is characterized by martensite type.

 

● Delivery status:

Generally, it is delivered in a heat-treated state, and the type of heat treatment is specified in the contract; if it is not specified, it is delivered in a non-heat-treated state.