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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.
Rodacciai Mark
RK4 RK4S
Kalite
41Cr4 - Nr.1.7035 41CrS4 - Nr.1.7039
A low-alloy steel with the addition of chromium only, it is primarily used in bolts for small- and medium-sized pieces.
Rodacciai Mark
RKS RKSPb
Kalite
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.
Rodacciai Mark
RK0S RK0SPb
Kalite
25CrMo4 - Nr.1.7218 25CrMoS4 - Nr.1.7213
Alloy 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.
Rodacciai Mark
RK0
Kalite
30CrMo4
Steel similar to the previous one: the greater carbon content makes welding more difficult, but favors temperability.
Rodacciai Mark
RD6 RD6Pb
Kalite
34CrMo4 - Nr.1.7220 34CrMoS4 - Nr.1.7226
Steel 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.
Rodacciai Mark
RK1 RK1Pb
Kalite
42CrMo4 - Nr.1.7225 42CrMoS4 - Nr.1.7227
The 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.
Rodacciai Mark
50CrMo4
Kalite
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.
Rodacciai Mark
RB2 RB2Pb
Kalite
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.
Rodacciai Mark
34CRNIMO6
Kalite
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.
Rodacciai Mark
30CRNIMO8
Kalite
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.
Rodacciai Mark
46CRB2
Kalite
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.
Rodacciai Mark
21CRMOV5-7
Kalite
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
Rodacciai Mark
31CRMOV9
Kalite
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
Rodacciai Mark
32CRB4
Kalite
32CrB4 – Nr.1.7076
Chrome-boron alloy steel generally used in bolts production
Rodacciai Mark
34CRS4
Kalite
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
Rodacciai Mark
36CRB4
Kalite
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
Rodacciai Mark
37CRS4
Kalite
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
Rodacciai Mark
51CRV4
Kalite
51CrV4 - Nr.1.8159
Chrome vanadiuam alloy steel generally used for hardened springs, keys, chisels
Rodacciai Mark
A105 K105
Kalite
A105
A carbon steel in accordance with US standards, it has a very high resilience even at low temperatures. Used for flanges, fittings, and construction in general.
Rodacciai Mark
RK1 B7 A193 B7M
Kalite
A193 B7 - A193 B7M
Steel produced at the quenched and tempered state according to the United States standard ASTM A-193, widely used for linkages and bolts destined for the oil industry. It is analytically similar to 42CrMo4 of the European standard. The B7M version, produced at higher temperatures, has slightly lower resistance characteristics but greater plasticity.
Rodacciai Mark
A193 B16
Kalite
A193 B16
A steel produced at the quenched and tempered state according to the United States standard ASTM A-193, it is used for linkages and bolts destined for the oil industry. Analytically similar to the 40CrMoV4-6 type of the European standard EN 10269. It has greater temperability than the previous type thanks to the higher amount of alloy elements.
Rodacciai Mark
A320 L7 L7M
Kalite
A320 L7 - A320 L7M
Steel produced at the quenched and tempered state according to the United States standard ASTM A320, used for linkages and bolts destined for use at low temperature in the oil industry. It has mechanical characteristics similar to the A193 B7 type, but additionally guarantees resilience values at low temperature. The B7M version, produced at higher temperatures, has slightly lower resistance characteristics but greater plasticity.
Rodacciai Mark
A320 L43
Kalite
L43 - 4340
Steel generally used in large size bolts up to 4” that require high performance of resilience at low temperatures , it has the same mechanical characteristics as the ASTM A320 L7 quality
