Quenched and tempered steels alloyed
Steels with alloy elements, temperable
Alloyed quenched and tempered steels contain alloy elements (manganese, chromium, nickel, molybdenum) in variable quantities and proportions that allow the desired temperability to be reached. In this way, larger pieces can be produced with structures transformed even to the core and suitable for the most demanding applications.
The alloy elements are chosen as a function of the type of characteristic that you wish to increase: for example, chromium improves hardness and toughness, while nickel has beneficial effects on resilience, event at low temperature, and on resistance and fatigue; molybdenum, finally, reduces the phenomenon of fragility upon tempering.
These steels are usually quenched and tempered in oil, which allows the production of pieces with even very complex shapes. The fields of application are quite varied: shaft-type components, gears, linkages, and mechanical pieces of any type.
RANGE Quenched and tempered steels alloyed
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Rodacciai Mark
RK4
RK4SSteel name
41Cr4 - Nr.1.7035
41CrS4 - Nr.1.7039A low-alloy steel with the addition of chromium only, it is primarily used in bolts for small- and medium-sized pieces.
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Rodacciai Mark
RKS
RKSPbSteel name
36CrMn5
A chromium and manganese alloy steel, no longer present in the unified standards, it is widely used in the quenched and tempered state for pins and hubs of heavy equipment and more generally in the automotive field.
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Rodacciai Mark
RK0S
RK0SPbSteel name
25CrMo4 - Nr.1.7218
25CrMoS4 - Nr.1.7213Alloy steel with chrome and molybdenum and a low carbon content; for this reason it is one of the few quenched and welded steels that can be welded (with some precautions) and it is used in gears and for small- and medium-sized pieces. The presence of molybdenum avoids the phenomenon of fragility by tempering.
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Rodacciai Mark
RK0
Steel name
30CrMo4
Steel similar to the previous one: the greater carbon content makes welding more difficult, but favors temperability.
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Rodacciai Mark
RD6
RD6PbSteel name
34CrMo4 - Nr.1.7220
34CrMoS4 - Nr.1.7226Steel with chromium and molybdenum, used in the production of average-sized pieces. At the quenched and tempered state it has good mechanical characteristics and does not suffer from embrittlement from tempering.
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Rodacciai Mark
RK1
RK1PbSteel name
42CrMo4 - Nr.1.7225
42CrMoS4 - Nr.1.7227The most widely used of the quenched and tempered steels. The excellent temperability and the absence of embrittlement fragility make this steel suitable for the production of a variety of pieces, also of medium-large size, with high mechanical characteristics.
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Rodacciai Mark
50CrMo4
Steel name
50CrMo4 - Nr.1.7228
Steel similar to the above, but with a higher carbon content. It is used for the same purposes, when a surface hardness obtained by induction tempering is also necessary.
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Rodacciai Mark
RB2
RB2PbSteel name
39NiCrMo3 - Nr.1.6510
A steel widely used in Italy, it is in any case included in the European standards. The addition of nickel in addition to chromium-molybdenum improves the performance of the pieces obtained, especially with regard to resistance to fatigue and vibrations.
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Rodacciai Mark
34CRNIMO6
Steel name
34CrNiMo6 - Nr.1.6582
This is the steel most commonly used in northern Europe when the addition of nickel is required by the severe use conditions. It has an elevated temperability thanks to the presence of significant levels of nickel and chromium: it is even suitable for the construction of large pieces that, at the quenched and tempered state, have well transformed structures down to the core.
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Rodacciai Mark
30CRNIMO8
Steel name
30CrNiMo8 - Nr.1.6580
Quenched and tempered steel with high temperability and toughness thanks to the high chromium content. It can be quenched and tempered at high resistance values and offers hardness consistency and uniformity. Generally used for pinions and shafts. Has average machinability on tool machines. Can be nitrided at the quenched and tempered state to increase resistance to wear and the fatigue limit.
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Rodacciai Mark
46CRB2
Steel name
46CrB2 - Nr.1.7075
Steel with a limited addition of chromium and boron, which provide greater temperability with respect to similar steels with carbon only (C45). It is not unified in any standard, but is used in the automobile industry and in other fields.
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Rodacciai Mark
21CRMOV5-7
Steel name
21CrMoV5-7 – Nr.1.7709
Alloy steel with chrome molybdenum vanadium, generally used for boilers, steel that resists at high temperatures up to about 550° C, generally used for particulars and shafts for turbines, nuts and tubes
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Rodacciai Mark
31CRMOV9
Steel name
31CrMoV9 – Nr.1.8519
Alloy steel with chrome molybdenum vanadium, generally used for boilers; steel resistant to high temperatures up to 540°C, generally used for plugs, gears, bushings, valves
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Rodacciai Mark
32CRB4
Steel name
32CrB4 – Nr.1.7076
Chrome-boron alloy steel generally used in bolts production
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Rodacciai Mark
34CRS4
Steel name
34Cr4 – Nr.1.7033 34CrS4 – Nr.1.7037
Low-alloy steel with addition of chrome only,similar to the 37CrS4 ; it is mainly used in bolts production for small and medium-sized pieces
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Rodacciai Mark
36CRB4
Steel name
36CrB4 - Nr.1.7077
Chrome-boron alloy steel with more carbon than 32CrB4; generally used in nuts and bolts production even in the most demanded classes
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Rodacciai Mark
37CRS4
Steel name
37CrS4 - Nr.1.7038
Low-alloy steel with the addition of chrome only , similar to the 41CrS4 mainly used in bolts production for small and medium-sized pieces
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Rodacciai Mark
51CRV4
Steel name
51CrV4 - Nr.1.8159
Chrome vanadiuam alloy steel generally used for hardened springs, keys, chisels
