BT Steel Strips Blog

Mild steel, also called plain-carbon steel, is the most common form of steel because its price is relatively low while it provides material properties that are acceptable for many applications, more so than iron. Low carbon steel contains approximately 0.05–0.3% carbon[1] and mild steel contains 0.3–0.6% carbon; making it malleable and ductile. Mild steel has a relatively low tensile strength, but it is cheap and malleable; surface hardness can be increased through carburizing.

Low carbon steels suffer from yield-point runout where the material has two yield points. The first yield point (or upper yield point) is higher than the second and the yield drops dramatically after the upper yield point. Low carbon steels contain less carbon than other steels and are easier to cold-form, making them easier to handle.

Bijoy Trading Company (BTC) is a complete solution to steel strips. If you are looking for quality steel strips, you can get OEM quality steel stips from our wide collection.
You can get any of these Strips as per your requirement:
Hardened Tempered Spring Steel Strips
Blue Tempered Strip Steel
CRCA High Carbon Steel Strips
Low Carbon Strips
Medium Carbon Strips
Rolling Hard Steel Strips
Razor Blade Steel Strips
Our products meet the specifications provided by the OEM and apart from serving our clients with their specific needs, we also keep on sharing knowledge as regards new technologies and innovations and the resultant outcome is a satisfied customer.
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These are basically as rolled hard steel strip. To achieve a desired hardness, an annealed material of suitable thickness is taken and rolled down to the required thickness, to achieve that required hardness. After rolling, the material is pinch passed and final annealing is not required. To choose the correct thickness (for reduction to the desired thickness) is a matter of expertise.
Grades: This strip is available in low, medium & high carbon grades.

Applications: It is suitable for components where formability is limited. It saves the extra annealing cost. The strip is directly punched & formed and if required sent for heat treatment.

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Good to excellent corrosion resistance combined with very
good weldability and formability characterize the austenitic
stainless steels. The austenitic structure has good creep resistance and good oxidation resistance that makes them useful at elevated temperatures. Austenitic steel can also be used in cryogenic applications and is in annealed condition the only non-magnetic steel.

Grade 316 is the standard molybdenum-bearing grade, second in importance to 304 amongst the austenitic stainless steels. The molybdenum gives 316 better overall corrosion resistant properties than Grade 304, particularly higher resistance to pitting and crevice corrosion in chloride environments. It has excellent forming and welding characteristics. It is readily brake or roll formed into a variety of parts for applications in the industrial, architectural, and transportation fields. Grade 316 also has outstanding welding characteristics. Post-weld annealing is not required when welding thin sections.

1018 is among the most commonly available grades available in the world. It is widely available in cold finished rounds, squares, flat bar and hexagons. Despite its unimpressive mechanical properties, the alloy is easily formed, machined, welded and fabricated. Due to its higher Mn content, it can, in thin sections, be hardened to Rc 42.

Applications
The alloy is a free machining grade that is often employed in high volume screw machine parts applications. It is commonly employed in shafts, spindles, pins, rods, sprocket assemblies and an incredibly wide variety of component parts.

Heat Treatment
1018 can, in thin sections be case hardened to Rc 42. In thicker sections, over 4″, Rc 28-30 can be obtained.
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Steel grades can be distinguished based on:

Chemical composition, such as carbon, low-alloy or stainless steel grades
Manufacturing methods, such as open hearth, basic oxygen process, or electric furnace methods
Finishing process, such as steel grades for hot rolled or cold rolled products
Product form, for example bar plate, sheet, strip, tubing or structural shape
Deoxidation practice, such as killed, semi-killed, capped or rimmed steel grades
Microstructure, such as ferritic, pearlitic and martensitic steel grades
Required strength level, for example steel grade A240 Grade C specified in ASTM standards has the tensile stress value between 515 and 655 MPa
Heat treatment performed, such as annealing, quenching and tempering, and thermomechanical processing.

Carbon steels and alloy steels are designated by a four digit number, where the first digit indicates the main alloying element(s), the second digit indicates the secondary alloying element(s), and the last two digits indicate the amount of carbon, in hundredths of a percent (basis points) by weight. For example, a 1060 steel is a plain-carbon steel containing 0.60% C

An “H” suffix can be added to any designation to denote hardenability is a major requirement. The chemical requirements are loosened but hardness values defined for various distances on a Jominy test.

The Chemical Composition of SAPH440 Steels: JIS G 3113 defines the chemical composition of SAPH440 steels as under:

Carbon (C) is not identified in the standard.

Manganese (Mn) is not identified in the standard.

Maximum percentage of Phosphorous (P) is 0.040 percent.

Maximum percentage of Sulphur (S) is 0.040 percent.

Remaining is iron (Fe) percentage and with few negligible impurities.

Mechanical Properties of SAPH440 Steels: The tensile strength of the SAPH440 Steels is expressed in Newton per millimeters and it must be at-least 440 N/mm2 (MPa). The yield strength is minimum 275 to minimum 305 N/mm2 (MPa) depending on the thickness. The elongation property of SAPH440 steel varies with the ranges of thickness. The minimum percentage ranges for elongation is 29 to 34 minimum. Only over 6.5 mm thickness requires 22 minimum percentage elongations. Higher thickness gauges usually show higher elongation than lower gauges.

Some other hot rolled commercial quality materials are also used in industrial applications, SPHC steel comparison with this grade of SAPH440 material will show how structural automobile hot rolled steel differs with commercial quality SPHC steel in chemical composition & mechanical properties.

Steel is considered to be an alloy steel when either (1) the maximum of the range given for the content of alloying elements exceeds one or more of the following percentages: manganese 1.65, silicon 0.60, copper 0.60; or (2) a definite range or definite minimum quantity of those elements considered alloys is specified. For example, chromium, molybdenum and nickel.

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