Engineering Steels Range
Bright low carbon free cutting and Commercial Quality Mild Steels
The bright low carbon free cutting engineering steels AISI 1215 or 12L14 have been developed primarily for their excellent and consistent level of machinability. These grades are therefore used where machining is the most important consideration, but high strength or the ability to withstand shock loading is not a requirement and welding will be minimal.
Both grades have high sulphur and increased manganese content to improve their machinability by the introduction of manganese sulphide (MnS) inclusions. These are distributed throughout the structure, promoting localised fracture in advance of the cutting tool. The swart produced is in the form of short chips, which exit the surface cleanly and do not wrap around the cutting tool, the result is an excellent surface finish.
Lead when added also acts as a chip former and lubricator for the cutting tool further improving machinability. While lead can cause some reduction in fatigue strength, ductility and toughness in the higher tensile engineering steels, it has little or no effect on the mechanical properties of the low tensile grades such as AISI 12L14.
Weldability of both grades is reduced somewhat due to the high sulphur, with it’s tendency towards brittleness when hot worked. This can be overcome however, by the use of suitable electrodes and correct welding technique.
The leaded grade has the additional problem of producing toxic fumes during welding, which must be carried out in a well ventilated environment or otherwise avoided.
CQ a commercial quality bright mild steel should be considered for those applications requiring more strength and/ or a better shock loading capability plus good weldability. This grade due to higher carbon and lower sulphur content has better strength with improved shock loading, welding and cold forming properties. Machinability while not as good as free cutting grades is reasonable, especially the cold drawn material.
To summarise: CQ has higher strength and better shock loading capabilities than AISI 1215 or 12L14, also much better weldability but lower machinability.
Bright Steels – Technical Spec Sheets
AISI 1215: Low Carbon Free Cutting Steel, with very good machinability but limited forming and welding properties. Will carburise, with a typical case hardness up to Rc60. End use: Lightly stressed parts.
AISI 12L14: Low Carbon Leaded Free Cutting Steel, with excellent machinability, but limited forming and poor welding properties. End use: Lightly stressed parts.
AISI 1018 / CQ: Low Carbon Commercial Quality Mild Steel, with excellent welding and forming properties plus good machinability. Will carburise, with a typical case hardness up to Rc60. End use: Light/medium stressed parts.
Case Hardening Steels
AISI 8620: Low Nickel-Chrome-Moly Steel, with core strengths of 700-1100 Mpa, in small to medium sections, and a typical case hardness up to Rc62, when carburised, hardened and tempered. End use: Light/medium stressed wear resistant parts.
En36A: Nickel-Chrome Steel, with core strengths of 850-1200 Mpa, in small to fairly large sections, and a typical case hardness up to Rc62, when carburised, hardened and tempered. End use: Medium/highly stressed wear resistant parts.
17CrNiMo6: Chrome-Nickel-Moly Steel, with core strengths of 900-1300 Mpa, in small to fairly large sections, and a typical case hardness up to Rc62, carburised, hardened and tempered. End use: Highly stressed wear resistant parts.
En39B: Nickel-Chrome-Moly Steel, with core strengths of 1000-1400 Mpa, in small to very large sections, and a typical case hardness up to Rc62, carburised, H&T. End use: Heavily stressed large wear resistant parts.
High Tensile Steels
AISI 4140: Chrome-Moly Steel, with an U.T.S. of 850-1000 Mpa, in sections up to 100mm. Will flame or induction harden – typical case hardness up to Rc54, and will nitride – typical case hardness up to Rc60. End use: Highly stressed parts.
AISI 4340: Nickel-Chrome-Moly Steel, with an U.T.S. of 930-1080 Mpa, in sections up to 100mm. Will flame or induction harden – typical case hardness up to Rc58, and will nitride – typical case hardness up to Rc60. End use: Highly stressed parts.
Medium Tensile Engineering Steels – Bright & Black
AISI 1045: Medium carbon engineering steels with good strength, toughness and resistance to wear plus good machining and welding properties. Will flame or induction harden, with a typical case hardness up to Rc58. End use: Medium stressed parts.
AISI D2: Air or oil hardening cold work tool steel, with maximum dimensional stability during heat treatment, offering very high abrasion resistance and hardness. End use: long run – deep drawing, forming, punching & slitting tools etc.
Other grades on request, subject to availability, mill minimum etc.
Alloy 352: Dezincification resistant Brass, offering excellent machinability plus good cold forming properties. End use: Valves, stopcocks or taps etc, in contact with chlorinated water.
Alloy 380: Section Brass, offering good machinability but limited cold forming properties. End use: Bolts, nuts, bearings, bushings, electrical components etc.
Alloy 385: Free Machining Brass, offering excellent machinability but limited cold forming properties. End use: Components produced on high speed lathes, switch terminals, lock bodies, trims and frames, architectural and electrical components.
LG2: Leaded-Gunmetal Bronze with excellent machinability and resistance to wear plus high seizure resistance. End use: Valve and pump parts, bushings etc.
Alloy 954: Aluminium Bronze with high strength, plus good corrosion, oxidation and wear resistance. End use: Pump rods, gear and worm wheels etc.
Alloy 110: Electrolytic Tough Pitch Copper, with high electrical and thermal conductivity, excellent ductility and workability, plus good corrosion resistance. End use: Electrical, mechanical, architectural and building components etc.
Hydraulic Cylinder Tube
HB 470 AR: Carbon-Manganese-Vanadium Steel, with high yield strength, plus excellent machinability and weldability. End use: Medium stressed parts etc.
Chrome Plated Bar
AISI 1045: Hard Chromium Plated Bars with extremely smooth hard wearing surface, excellent corrosion resistance, and high dimensional and straightness tolerances. End use: Hydraulic and pneumatic cylinders etc.
AISI 1045 Induction Hardened: Hard Chromium Plated Bars (as above), plus a hardened case Rc55-60. End use: Parts with high resistance to surface impact.
AISI 4140: Hard Chromium Plated Bars with tensile strengths of 800 – 1200 MPa.
End use: Highly stressed hydraulic cylinders etc.
38 MnVS6: Hard Chromium Plated Bars with tensile strengths of 800 – 950 MPa.
End use: Medium to highly stressed hydraulic cylinders etc.
4E: Grey Cast Iron with excellent machinability and good resistance to wear.
End use: Bushings, bearings, gears, pistons, pulleys, sprockets etc.
3D: Ductile Cast Iron with good strength, toughness and impact resistance.
End use: Gears, sprockets, plus applications requiring good resistance to shock.