Introducing the types of sheets and coloring


Black Plate (St37-2)


ST37 plate, also known as black plate or mild steel, is one of the most common non-alloy steels used in the construction industry and is recognized as mild steel among consumers. This plate is classified as a low-carbon steel. In the analysis of ST37 plate, the symbol “ST” stands for structural steel, which represents the ultimate tensile strength of the steel, and “37” indicates the tensile strength of 370 newtons per square millimeter. Sometimes after ST37, the numbers 2, 1, and 3 (untreated, deoxidized (produced by Noorad and Steel Parts Manufacturing Company), and fully deoxidized) are added. The standard for this plate is DIN17100 with material number 1.0037 and is recognized under national standard 235-2. This type of plate has medium strength. The low percentage of carbon in these plates increases their weldability. In addition to construction, these plates are used in shipbuilding, bridge construction, and metal structures and profiles such as I-beams, angles, and other structural sections. They are also used in heavy machinery, agriculture, and industrial equipment in high thicknesses for bodywork, parts, and accessories.

Anti-abrasion Building Plate (ST44-2)

White + Red

ST44 plate is one of the non-alloy steels used in the construction industry as an anti-abrasion material. This plate contains about 0.2% carbon. In the analysis of the ST44 plate, the symbol “ST” represents structural steel, and “44” indicates the tensile strength of 440 newtons per square millimeter. Sometimes, after ST44, the numbers 2, 1, and 3 appear (indicating untreated, deoxidized, and fully deoxidized products). The standard for this plate is DIN17100 and is identified by the material numbers 1.0144 and 1.0044. This type of plate has higher strength than black plate, and the low carbon percentage in these plates increases their weldability. The ST44 plate is machineable and is mainly used in construction and machinery in the form of plates, multi-sided sections, pipes, and profiles. In cases where higher strength than ST37 is required, this plate can be produced with a lower thickness or weight.


Industrial sheet or low-carbon manganese steel (ST52-3U)

Yellow + Red


ST52-3U sheet belongs to alloy steels in the construction industry and is classified as soft steel. In the analysis of ST52 sheet, the symbol “ST” refers to structural steel with a yield strength equivalent to 355 newtons per square millimeter and a desirable tensile strength of 490 to 630 newtons per square millimeter. The letter “U” in this type of steel indicates its weldability. Sometimes the numbers 2, 1, and 3 (untreated, treated, and fully treated oxygen removal, respectively) come after ST52. This product is manufactured by Nourad and is used for producing steel components. The standard for this sheet is DIN17100. This type of sheet has higher strength than ST44. Since ST52 sheet is obtained from the hot rolling process, it has high weldability. In thicknesses greater than 25 millimeters and above 0.20 percent carbon and 1 percent manganese, due to its hardening ability, it requires preheating and post-weld heat treatment, temperature control between passes, proper joint selection, and welding methods. Steel sheet has other notable properties such as resistance to twisting, bending, weight tolerance, and elasticity. For this reason, it is widely used in various infrastructure projects in important industries, especially in the automotive industry. Due to the presence of silicon and manganese elements, it has higher resilience and strength. Unlike the ST37 and ST44 models, this steel can be used in thermal operations used in abrasive consumption. The ZST52-3N grade, which has the same chemical composition and only has a minimum of 0.02% A1, has the ability to cold form. This sheet can be produced with less thickness or weight. It should be noted that this sheet also works efficiently at very low temperatures.


Low Alloy Steel Plate (ST60-2)




ST60 plate is known as a low alloy steel plate in the high-strength steel category in the construction industry. This plate falls under the category of medium carbon steels. In the analysis of ST60 plate, the symbol ST stands for structural steel, and 60 indicates a tensile strength of 600 Newtons per square millimeter. Sometimes after ST60, the numbers 2, 1, and 3 (un-deoxidized, deoxidized (produced by Nourad company for producing steel parts), and fully deoxidized) are added. The standard for this plate is known as DIN17100. Due to the average carbon content of 0.4% (equivalent to more than 0.5% carbon), there is a tendency to crack in the heat-affected zone during welding due to the formation of martensite. Therefore, preheating is necessary to control the cooling rate of the welded metal and heat-affected zone, and ultimately the formation of martensite. Additionally, post-weld heat treatment is required for 2 to 3 hours per 25 millimeters to prevent cold cracking. This type of plate is mainly used in metal frames, structures, and steel bridges. Unlike the ST37 and ST44 models, this steel can be used in heat treatment operations and is also used in abrasion applications and the manufacture of automobile and machinery parts. Grade ST60-2 is used for cold forming and stretching. The company’s ST60 plate product is compliant with Grade ST60-2 and is delivered as As Rolled.



Stainless Steel Sheet (ST70-2)




ST70-2 sheet is classified as an alloy steel in the building industry and falls into the category of medium carbon steels. In the analysis of ST70-2 sheet, the symbol ST represents structural steel, and 70 indicates the ultimate tensile strength of 700 Newtons per square millimeter. Sometimes after ST70, the numbers 2, 1, and 3 (unoxidized, deoxidized (produced by Noward company for steel parts production), and fully deoxidized) are added. This sheet is standardized under DIN17100. It has higher strength compared to ST44-2 and ST52-3. Medium carbon steels, with a carbon content of about 0.45 (and an equivalent carbon content of over 0.6%), have over 50% sensitivity to cracking in the weld zone. Therefore, to control martensitic formation, preheating operations are necessary, and for hydrogen removal, post-weld heat treatment is required. These types of steels are designed for heavy-duty truck parts production, steel structures, and mobile cranes to work under incredible pressure loads.


CK45 Steel Plate


White + Blue


Ck45 or mold steel plate is a widely used and wear-resistant alloy sheet with a hardness of 160 to 190 Brinell. Ck plate belongs to the category of medium carbon steel, with a chemical composition of 0.35% carbon, 0.25% silicon, and 0.65% manganese. This plate is not resistant to corrosion and rust due to the absence of the chromium element. CK45 is known as one of the most widely used alloy plates in the machine industry, and due to its reasonable price, it has many applications in various other industries. The standard for this plate is DIN17200 and is known as material number 1.1191 in the group. Welding of steel depends not only on the type of material and its chemical composition but also on its shape, dimensions, manufacturing method, and service conditions. Due to the carbon grade of CK45 steel (about 0.63), its sensitivity to crack under the weld bead reaches about 75%. As the hardness under the weld bead reaches about 325 Vickers. Therefore, in order to prevent cracks in the welding area, preheating operations should be carried out in the range of 100 to 200 degrees Celsius, as well as post-weld heat treatment at higher temperatures than the preheating temperature for 2 to 3 hours, in addition to using moisture-resistant coated electrodes. According to AWS standard, E9018 electrode with a preheat temperature of 150 degrees Celsius is recommended. This type of steel is used to make industrial molds, automotive parts, mechanical engineering, industrial motors, industrial crankshafts, pump shafts, and also for wear applications in heat-treated conditions.



CK60 Spring Steel Sheet


Yellow + Blue


CK60 steel sheet, also known as 1.1221, is a heat treatable alloy steel and belongs to the category of carbon steels. Its properties include higher strength and hardness compared to CK45 steel, making it suitable for high load-bearing sections. CK60 steel sheet is a type of spring steel sheet, with a chemical composition of 0.61% carbon, 0.4% silicon, 0.6-0.9% manganese, and small amounts of phosphorus and sulfur. This sheet is annealed at 700-650 degrees Celsius and forged at 1100-850 degrees Celsius, with a Brinell hardness of 241. The standard for this sheet is based on DIN standard with material number 1.1221, and it belongs to the category of soft high carbon steels.


Due to its high carbon content (average 0.6%), welding this steel has high sensitivity to cracking in the weld and heat-affected zones. Therefore, low hydrogen welding guidelines and preheating between passes at around 200 degrees Celsius should be used to prevent the formation of martensite and crack formation. CK60 spring steel sheet is widely used in the spring belt industry and is commonly used in automobile and engine parts as well as mechanical engineering. Other applications of this sheet include the oil and gas industry.



Pickling Sheet (STW24)


White + Green


STW24 is used as pickling sheet in the production of non-alloy hot rolled steel products for cold forming. This steel does not have the ability of heat treatment, quenching, and surface hardening. For many lower-end producers who consume black sheets, this is an undesirable feature. To combat the harmful effects of this oxide layer, the pickling sheet production line is built using hydraulic rollers and tanks filled with acidic substances. The result of this pickling sheet production line will be a high-quality black sheet without oxide layers and ready for cold rolling, forming, shaping, and cutting operations. This sheet is called Hot Rolled Pickled and Oiled or HRPO in Latin. Although the pickling sheet is free of black oxide layers, it is still referred to as black sheet in the iron industry and market. Pickling sheets are not used as structural steel according to DIN17100. The produced sheet is completely oxygen-free in the rolling and production of steel parts. This steel is used for cases where cold forming and welding ease are desired. Tank and fluid storage tanks, galvanized pipes, automotive body parts, and general engineering applications are the major uses of this sheet. These types of sheets are mainly used in metal structures, structures, and metal bridges.



Anti-wear plate (WR100)




WR110 plate is known as an anti-wear steel plate and is classified as a heat-treated steel. In terms of carbon content, WR110 (with an average carbon content of about 0.42%) is classified as a medium carbon steel. When tempered to obtain a martensitic structure, it exhibits relatively good wear resistance. By performing tempering operations and creating a fine or coarse pearlite structure, the wear resistance can be achieved at lower levels. This company’s product is offered as “as-rolled”. This type of plate has a higher strength than ST44. Welding in anti-wear plate is selected based on thickness, desired quality, cost, and other effective factors of the welding process and method. Due to the higher equivalent carbon content of this steel (about 0.74) compared to the equivalent carbon content of CK45 steel, welding it is more difficult and it is more sensitive to cracking. Therefore, in addition to using dry and hydrogen-free electrodes, preheating should be applied as much as possible in the range of 150-200 degrees Celsius and for high thicknesses in the range of 260 to 316 degrees Celsius. Anti-wear plates are used as high-strength low-alloy steel in building construction, metal bridges, pressure vessels at low temperatures, and industrial parts such as axles, chains, bolt screws, crusher frames, wear plates, hand tools, and various machine parts.


Anti-wear Plate (WR300)


Red + Blue


The WR300 plate is a heat-treatable low-alloy steel that is classified as an anti-wear plate. In terms of carbon content (averaging 0.42%), the anti-wear plate is considered to be a medium carbon steel. The standard for this type of steel is designed for internal company alloy steel products. This steel is equivalent and very close to the grade (6304 group of chromium-molybdenum-vanadium steels) in the ASE/AMS standard. According to DIN17350 standard, it is equivalent to grade 48CrMoV6-7 in the group of tool steels with material number 2323/1. Due to its equivalence with the above-mentioned table steels and accompanying alloying elements, the WR300 steel has relatively high strength, suitable hardness and toughness, and is therefore suitable for use in wear applications, molds, and cold extrusion to produce high-quality machine parts. It can be used in the following applications: mechanical excavators, anti-wear plates, lifting vessels, drilling equipment, crushers, loader teeth, mining machine wheels, crusher frames, mold coatings, intermediate bushes, extrusion die holder, centrifugal and pressure casting molds, and industrial saw blades.



Steel Plate 4140 (Mo40)


Not available


The alloy plate MO40, also known as AISI 4140, is a molybdenum, chromium, and manganese alloy steel. This plate is categorized as low-alloy steel and is widely used in the oil and gas industry. Some notable features of MO40 steel plate include resistance to wear and impact, high fatigue strength, and high torsional strength. In the steel industry, AISI 4140 plate is similar to AISI 4130 grade, except that AISI 4140 uses a higher amount of carbon in its chemical structure. The higher carbon content in the MO40 plate allows it to exhibit greater resistance to various heat treatment operations, making it more suitable for such operations compared to AISI 4140. However, the properties of this plate also result in a lower weldability compared to AISI 4130. In the table below, you can see the chemical composition of MO40 alloy steel. The simplicity of the chemical composition of this plate makes it useful in various fields. This steel is used in the manufacturing of automotive and mechanical parts such as axles, shafts, pinions, drive shafts, gears, connecting rods, screws, and bolts. It is also suitable for pump shafts and for nitriding hardening operations using gas or liquid methods. This way, maximum resistance to wear and impact can be achieved, and it can be used in applications that require resistance to fatigue, wear, and high temperatures.



Marine Plate (A517B)


Blue + Green


This steel plate is classified as a high-strength alloy or pressure vessel plate according to ASTM grade A517B/A517M-93. The composition of this plate includes an average of 0.18% carbon, 0.87% manganese, 0.25% silicon, less than 0.35% phosphorus, and 0.35% sulfur.


Due to its average carbon content of 0.18% and an equivalent carbon content of approximately 0.48%, the welding of this steel is relatively suitable. However, in the quenched and tempered state, especially in thick thicknesses, the minimum preheat temperature should be observed between the weld passes. This is because the heat-affected zone of the weld may be re-austenitized and transformed into high-carbon martensite or coarse bainite, causing reduced toughness and cracking in the weld area.


The properties of this plate include high strength and resistance to corrosion. It is used in abrasive applications such as manufacturing excavation equipment, mining, as well as in the construction of boilers and pressure vessels, stairs, TV towers, fans, and ships. It is also used in thick sections for the construction of nuclear pressure vessels.



A516Gr.70 Firebox Plate


Red + Green


This steel is classified under the ASTM A516 standard in the carbon steel group and is known as the firebox plate. A516 plate is a carbon steel plate in which small amounts of elements such as phosphorus and sulfur, as well as elements such as manganese and silicon, are used at the highest allowable levels to produce a high-quality carbon steel plate with bending and lensing properties. The firebox plate is a type of structural steel plate that is produced and supplied in two grades: 60 and 70. The 16-gram A516 plate and the 70-gram A516 plate are mainly used in the storage tank and steam boiler industries. A516 steel plates have high tensile strength and an acceptable percentage of elongation, making them suitable for the construction of tank walls with bending and lensing. Grade A516 Gr.70 is commonly used in low to medium-pressure vessels in the gas, oil, and petrochemical industries. Typically, products under this standard are offered in as-rolled condition and are normalized and stress relieved upon customer request. Therefore, they are not classified as heat-treated steel grades.