Heat treated low, medium and high carbon steel / carbon tool steel / spring steel

Sungil Special Steel Co.,Ltd have been specializing in heat treatment for several dacades in Korea. We are very proud of our technology for this industry.

This is the steel grade of heating treatment available.

Low carbon steel(Normal steel)         KS       JIS   
                                                      SPCC  SPCC

Medium carbon steel   KS    JIS   DIN     GB    SAE
                                  S30   S30   Ck30   30     1030
                                  S35   S30   Ck35   35     1035
                                  S45   S45   Ck45   45     1045

high carbon steel    KS       JIS      DIN     GB     SAE
                             S50C   S50C   Ck50    50      1050
                             S55C   S55C   Ck55    55      1055
                             S60C   S60C   Ck60    60      1060
                             S65C   S65C   Ck65    65      1065
                             S70C   S70C   Ck70    70      1070
                             S75C   S75C   Ck75    75      1075

Carbon tool steel    KS        JIS       DIN         GB     SAE
                                    SK2    SK2     C125W2     T12
                             SK3    SK3     C105W2     T10     1095
                             SK4    SK4                                    1086
                             SK5    SK5     C105W2      T8     1080

Spring steel         SUP10  SUP10  50CRV4  50CrVA  6150

Thickness : 0.1~2.0mm
Width : 5~ 250mm

Best heat treatment for Special Steel strip and good quality & price

Please feel free to ask any inquiries about our product for your product's manufacture.

We hope to have good business with you.

Homepage : http://www.sungilsteel.co.kr/
E-mail : sungil97@chol.com

Stationery knifes / cutter blades

Sungil Special Steel Co.,Ltd has the other division that is stationery knifes/cutter blades division.

From steel strip material to complete products, we own manufacture facilities for blades.

Due to this, we offer good price and good qualty for our custom's requirements.

We have been suppling our products to one of major stationery makers in Korea and to overseas countries such as Malaysia,  Turkey and Iran so on.

*Material : (JIS)SK3,SK5 (AISI) W1-10, W1-8
*Heat treated
*Thickness : 0.4mm, 0.5mm
*Width : 9.3mm, 18mm
*OEM Service Offered / Buyer Label Offered / Design Service Offered



Pleas let us know any questions that you might have about our product withour hesitation.

E-mail : sungil97@chol.com
Homepage : http://www.sungilsteel.co.kr/

Heat treating , Quenching and Tempering

Sungil Special Steel Co.,Ltd specializes in heat treating for special steel.

Let's talk about heat treating briefly.

Heat treating is a group of industrial and metalworking processes used to alter the physical, and sometimes chemical, properties of a material. The most common application is metallurgical. Heat treatments are also used in the manufacture of many other materials, such as glass. Heat treatment involves the use of heating or chilling, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. Heat treatment techniques include annealing, case hardening, precipitation strengthening, tempering and quenching. It is noteworthy that while the term heat treatment applies only to processes where the heating and cooling are done for the specific purpose of altering properties intentionally, heating and cooling often occur incidentally during other manufacturing processes such as hot forming or welding.

Quenching is a process of cooling a metal very quickly. This is most often done to produce a martensite transformation. In ferrous alloys, this will often produce a harder metal, while non-ferrous alloys will usually become softer than normal.

To harden by quenching, a metal (usually steel or cast iron) must be heated above the upper critical temperature and then quickly cooled. Depending on the alloy and other considerations (such as concern for maximum hardness vs. cracking and distortion), cooling may be done with forced air or other gases, (such as nitrogen). Liquids may be used, due to their better thermal conductivity, such as water, oil, a polymer dissolved in water, or a brine. Upon being rapidly cooled, a portion of austenite (dependent on alloy composition) will transform to martensite, a hard, brittle crystalline structure. The quenched hardness of a metal depends on its chemical composition and quenching method. Cooling speeds, from fastest to slowest, go from polymer (i.e.silicon), brine, fresh water, oil, and forced air. However, quenching a certain steel too fast can result in cracking, which is why high-tensile steels such as AISI 4140 should be quenched in oil, tool steels such as ISO 1.2767 or H13 hot work tool steel should be quenched in forced air, and low alloy or medium-tensile steels such as XK1320 or AISI 1040 should be quenched in brine or water.

However, most non-ferrous metals, like alloys of copper, aluminum, or nickel, and some high alloy steels such as austenitic stainless steel (304, 316), produce an opposite effect when these are quenched: they soften. Austenitic stainless steels must be quenched to become fully corrosion resistant, as they work-harden significantly.

Tempering

Untempered martensitic steel, while very hard, is too brittle to be useful for most applications. A method for alleviating this problem is called tempering. Most applications require that quenched parts be tempered. Tempering consists of heating a steel below the lower critical temperature, (often from 400 to 1105 ˚F or 205 to 595 ˚C, depending on the desired results), to impart some toughness. Higher tempering temperatures, (may be up to 1,300 ˚F or 700 ˚C, depending on the alloy and application), are sometimes used to impart further ductility, although some yield strength is lost.

Tempering may also be performed on normalized steels. Other methods of tempering consist of quenching to a specific temperature, which is above the martensite start temperature, and then holding it there until pure bainite can form or internal stresses can be relieved. These include austempering and martempering.

References to Wikipedia

We have a Utility Model for continuous cooling system of martensite cold rolled stainlees steel coil. We are pride of our technology for heat treating industry. 

We are very sure that we can meet your requirements.

Please feel free to ask any questions and inquires

E-mail : sungil97@chol.com

Homepage : http://www.sungilsteel.co.kr/

  

Kosco opens blog !!!

We are one of main heat treatment comapanies, Sungil Special Steel Co,.Ltd in Korea.

Kosco is a subsidiary of Sungil Special Steel Co,.Ltd for trade.

Our main product are special steel strip and stationery cutter blades.

We supply our products to many companies in Korea. Also, we export our products to another countries such as USA, Germany, Turkey, Hongkong, Malaysia, India, Iran so on.

Homepage : http://www.sungilsteel.co.kr/
E-mail : sungil97@chol.com

More information will be updated soon!!