Cold-rolled steel is sheet steel that is rolled at a low temperature in a continuous cold-rolling mill operation. Generally available only in thicknesses less than 3.2 mm, cold-rolled strip is useful for a wide range of applications.

BlueScope Distribution’s cold-rolled products are available with a high-sheen glossy or matt finish to meet all surface-finish requirements from paint and lacquer to electroplating.

Because BlueScope Distribution’s cold-rolled steel is manufactured and tested in accordance with Australian steel standards, our customers can be assured they will get the best quality whether they need to produce items that require carbon and hardness, those that need to be easily formed, steel that will be used for structural purposes, or products that require vitreous enamelling.

Australian Standards for Cold-Rolled Steel

BlueScope Distribution produces cold-rolled steel sheet and strip in accordance with the dual Australian/New Zealand standard, AS/NZS 1595:2013 Cold-rolled, unalloyed, steel sheet and strip. The standard specifies the requirements for cold-rolled carbon steel that does not contain alloys and has been produced on a continuous mill to conform with specified prerequisites relating to strength, hardness, and formability. It may be supplied as coil as well as in cut lengths.

The standard allows for a number of different grades of steel produced by cold-rolling:

  • Three temper-rolled grades that are produced to specific hardness requirements.
  • Five grades that are produced to specific strength requirements, including a weather-resistant grade.
  • Five grades that each have specific formability requirements.

In addition, the standard specifies two different surface finishes (matt and sheen), and there is provision for three levels of surface quality.

Both manufacturing requirements, including chemical composition and manufacturing tolerances, and mechanical property requirements of the cold-rolled steel are discussed in the standards. Five tests are specified:

  1. Hardness test
  2. Bend test
  3. Tensile test
  4. Strain-age test
  5. Plastic strain ratio test

Product Groups for Specific Manufacturing Requirements

BlueScope Distribution produces four different types of cold-rolled steel to meet the full range of manufacturing requirements:

  • Carbon and hardness products
  • Formable products
  • Structural products
  • Vitreous enamelling products

In addition, the company also produces a range of enhanced weather-resistant steels for non-industrial and non-marine environments.

Carbon and Hardness Products

Carbon and hardness products have excellent formability, weldability, and bending attributes. Manufacture is based on the carbon content of the steel and both chemical composition and minimum hardness are guaranteed.

There are four carbon/hardness grades:

  1. CA1010H-E cold-rolled in accordance with AS/NZS 1365 in thicknesses ranging from 0.7 to 3.2 mm. It is supplied with an untrimmed mill edge.
  2. CA85T-G produced in accordance with AS/NZS 1365 and 1595 in thicknesses that range from 0.4 to 3.2 mm. It is also supplied with an untrimmed mill edge. This grade is cold rolled and oiled.
  3. CA45S-D produced in accordance with AS/NZ 1365 in thicknesses from 0.6 to 1.4 mm. Cold-rolled and skin-passed, it is supplied with a trimmed edge.
  4. DRUMSTOCK®, produced in accordance with AS/NZ 1365 in thicknesses from 0.6 to 1.4 mm. Like the above grade, it is cold-rolled and skin-passed and supplied with a trimmed edge.

The carbon products are used for a wide range of items from bearings, seals, and hardened washers to hinges. Hardness products are commonly used for drum bodies and ends, and other products required by the container market.

Formable Products

Formable products are non-ageing and free from stretcher strain that usually results in defects because the metal has hardened beyond its yield point. Like carbon/hardness products, formable products have excellent formability, weldability, and bending, as well as really good pressing attributes.

There are four cold-rolled formable grades all of which are produced in accordance with AS/NZ 1595 and 1365. All four are also oiled, but only two are skin-passed, a process that improves the mechanical properties of the steel as well as flatness and surface texture. They all have trimmed edges.

  1. CA2S-E that is 0.5 to 3.2 mm thick and cold-rolled, skin-passed, and oiled.
  2. CA3SN-G that is 0.6 to 3.2 mm thick and cold-rolled, skin-passed, and oiled.
  3. CA4A-G that is 0.6 to 2.2 mm thick and cold-rolled, oiled, but not skin-passed.
  4. CA5SN-E that is 0.6 to 3 mm thick and cold-rolled, oiled, but not skin-passed.

Formable products have high-quality surfaces that are suitable for exposed and general purpose applications. They are used for many different purposes ranging from drawn parts and pressings for the automotive industry to non-exposed panels, office or industrial shelving and furniture.

Structural Steel Products

Structural steel products are made from temper-rolled, high-alloy steel that has a guaranteed minimum strength yield ranging from 180 to 350 MPa. In addition, these products have excellent weldability and excellent formability.

There are six BlueScope structural products that are cold rolled, all of which are skin-passed and oiled. They all also have trimmed edges.

  • CA180S-G is produced in accordance with AS/NZ 1365 and is 0.7 to 1 mm thick.
  • CU200T-G is also produced in accordance with AS/NZ 1365 but is 0.5 to 3.2 mm thick.
  • CA220S-G is produced in accordance with AS/NZ 1365 and 1595 and is 0.6 to 2 mm thick.
  • CA250T-G is produced in accordance with AS/NZ 1365 and is 0.7 to 2.5 mm thick.
  • CA260S-G is produced in accordance with AS/NZ 1365 and 1595 and is 0.6 to 2.5 mm thick.
  • CM350-G is produced in accordance with AS/NZ 1365 and is 0.7 to 2 mm thick.

Of course, there will be other factors that differ too but these structural products are suitable for a wide range of items from automotive seat parts and other components to guard rails, tubing, and various structural sections.

Vitreous Enamelling Products

Vitreous enamelling products are quite literally steel items that need to be finished with vitreous enamel and include bathtubs, heaters, architectural panels, and stove liners. They are all cold-rolled, skin-passed, and oiled, and have deep or extra-deep drawing capability.

Certified only for mechanical properties, the primary vitreous enamelling products from BlueScope are both manufactured in accordance with AS/NZS 1365. Both have trimmed edges.

  • CV2S1 is available in a thickness range from 0.5 to 3.2 mm.
  • CV4S2 is available in a thickness range from 0.75 to 1.6 mm.

Weathering Steel Products

Weathering steel products have a distinctive patina that forms as a result of constant exposure to the atmosphere. Products are typically used for shipping containers, bridges, and rolling stock.

The technical team at BlueScope Distribution can help ascertain your specific needs.