. . Characteristics of materials,
. . . , r
The steel is a Chinese standard grade and is a high-toughness hammer forging die steel with good toughness, strength and high wear resistance. Compared with r
steel, this steel has higher strength, toughness and thermal fatigue resistance at high temperatures, and its mechanical properties at room temperature and r~
℃ are almost the same. When heated to ℃, the hardness of about ℃ can still be maintained. Because the steel contains molybdenum, it is not sensitive to temper brittleness. After slowly cooling down from
℃, the impact toughness decreases slightly. This steel has good hardenability. ,
,
The hardness of each part of the cross section is almost the same after oil quenching at
℃ and tempering at
℃. However, this kind of steel is easy to form white spots, and the smelting process and cooling system after forging and rolling need to be strictly controlled. ,
. . . The optimal isothermal temperature is, r~
℃. Normalizing can refine the metallographic structure and improve mechanical properties. After tempering at high temperature, the hardness of steel is reduced, and it is used for large and medium-sized hot forging modules (thickness, r3~
) to refine the forged structure and improve strength and toughness. ,
. . The high-temperature tempering and softening process can be used as a softening treatment for small hot-working module forging blanks (thickness < ,
﹚,
and before the renovation of old molds. ,
. . Delivery status,
. . Unannealed state, hardness, r~
, annealed state, hardness,
. ,
. . . Chemical composition,
. . , r~
, ,
, r
, , r.~
, ,
, r.3
, ,
, r.3
, , r.~
, , r.~
, , r.~.3< br/>. ,
. . . Reference to the corresponding grade,
. . . China,
standard grade, r
, Taiwan, China,
standard grade,
, Germany ,
Material number, r
, Germany,
standard grade,
, Spain,
standard grade, r
, United States,
standard Brands,
, United States,
standard brands,
, Japan,
standard brands,
, Japanese Datong standard brands,
, Japanese Hitachi standard brands,
, South Korea,
Standard grades,
, International Organization for Standardization,
Standard grades,
, France,
Standard grades,
, Russia , r
standard grade,
, Sweden,
standard grade,
, UK,
standard grade, r
. ,
. . .
. . . Typical application examples,
. . . ,
) for forging, r
Steel billet, forging size ( , r+
,
),
, the average service life of the die is about,
times. ,
. . ,
) used to make various large forging dies. ,
. . ,
) can be used for cavity insert materials of the following materials, commonly used alloys,
, ,
, quenched, r~
. ,
. . .
5crnimo mold steel