Technical Information

Home / Technical Information
Surface Treatment
Mechanical properties
TECHNICAL THREAD TABLE
Steel Information
Stainless Steel Information

Steel raw material information

  • Low carbon steel : generally contains less than 0.30% carbon and is characterized by excellent formability and weldability, making it highly suitable for metal forming and welding operations. Moreover, it is more cost-effective compared to other steel materials. Low carbon steel has a tensile strength ranging from 60,000 psi to 80,000 psi (410 MPa to 550 MPa), which makes it appropriate for the production of various fasteners such as screws, nuts, and rivets, particularly those with hardness grades of 4.6, 4.8, and 5.8. Examples of low carbon steel grades include 1006, 1008, 1010, 1018, and 1022. Additionally, screws and nuts made from low carbon steel are often coated or plated to enhance their rust resistance effectively, making them well-suited for diverse applications from construction to automotive manufacturing.
  • Medium carbon steel : contains approximately 0.3% to 0.6% carbon by weight, making it stronger and harder than low carbon steel. This steel type responds well to heat treatment, significantly improving its mechanical properties, such as tensile strength and hardness. Examples of fasteners made from medium carbon steel include Class 8.8 screws and Class 8 nuts, which utilize grades 1030, 1035, 1040, 1045, and 1050. These fasteners have a minimum tensile strength of 830 MPa and a hardness of 22-32 HRC. They are widely used in the manufacturing and engineering sectors.
  • Alloy Steel : This type of steel contains elements such as boron, manganese, chromium, silicon, and others to enhance the capabilities of alloy steel in terms of hardness, formability, toughness, and high-temperature durability beyond what is found in low and medium carbon steels. After undergoing heat treatment, alloy steel achieves a minimum tensile strength of 1,220 MPa (176,000 psi). SCM435 and SCM440, for instance, are frequently utilized in the manufacture of grade 10.9 and 12.9 screws and bolts, as well as critical components in the mold industry, mechanical manufacturing, and automotive body structures that require high strength and durability.

Stainless Steel Information

  • Stainless Steel : is a corrosion-resistant alloy steel containing a minimum of 10.5% chromium. Unlike ordinary carbon steel, the presence of chromium produces a thin layer of oxide on the surface of the steel known as the 'passive layer'. This layer prevents further corrosion and gives stainless steel its characteristic appearance and durability. The properties of stainless steel can be further enhanced by adding other elements like nickel, molybdenum, titanium, and manganese, which can improve its strength, ductility, and resistance to corrosion and oxidation. Stainless Steel can be divided into 3 classes - Austenitic, Martensitic and Ferritic.
  • Austenitic stainless steel : is a corrosion-resistant alloy with high chromium and nickel levels, known for its excellent formability, weldability, and non-magnetic. It is also extensively used in fasteners, such as bolts, screws, and nuts, due to its superior corrosion resistance and strength at both high and low temperatures. The non-magnetic nature and exceptional ductility of austenitic stainless steel make these fasteners ideal for applications in corrosive environments, including marine, chemical processing, and outdoor construction. Grades 304 and 316 are most common.
  • Martensitic stainless : steel stands out due to its elevated carbon levels, which enable hardening via heat treatment, thereby enhancing its strength and resistance to wear. Within the fastener sector, stainless steel grade 410 is favored for its robustness and mild ability to resist corrosion, making them ideal for manufacturing self-drilling screws.

Property Class od Stainless Steel Fasteners

Technical Thread Table

Mechanical Properties

ตามมาตรฐาน ISO 898 ส่วนที่ 1
(สมบัติทางกลถูกกำหนดไว้สำหรับการทดสอบที่อุณหภูมิห้อง)

  • a ค่าไม่ใช้สำหรับการยึดโครงสร้าง
  • b สำหรับการยึดโครงสร้าง d ≳ M12.
  • c ค่าทางชื่อเรียกถูกกำหนดเฉพาะสำหรับวัตถุประสงค์ของระบบการกำหนดชื่อสำหรับชั้นคุณสมบัติ ดูข้อ 5
  • d ในกรณีที่ความแข็งแกร่งขั้นต่ำ ReL ไม่สามารถกำหนดได้ สามารถวัดความเครียดที่ 0.2% ของการยืดต่อปริมาณ Rp0,2
  • e สำหรับชั้นคุณสมบัติ 4.8, 5.8 และ 6.8 ค่าสำหรับ Rpf min กำลังอยู่ในระหว่างการสอบสวน ค่าปัจจุบันได้รับสำหรับการคำนวณอัตราความเครียดที่พิสูจน์เท่านั้น พวกเขาไม่ใช่ค่าทดสอบ
  • f การโหลดที่พิสูจน์ถูกกำหนดไว้ในตาราง F.006
  • g ความแข็งที่กำหนดไว้ที่ปลายของตัวยึดควรเป็น 250 HV, 238 HB หรือ 99.5 HRB สูงสุด
  • h ความแข็งของผิวต้องไม่เกิน 30 จุดวิกเกอร์เหนือความแข็งแกร่งของแกนของตัวยึดเมื่อการกำหนนดความแข็งของผิวและความแข็งของแกนทำด้วย HV 0.3
  • i การเพิ่มความแข็งที่ผิวซึ่งแสดงว่าความแข็งของผิวเกิน 390 HV ไม่เป็นที่ยอมรับ
  • j การเพิ่มความแข็งที่ผิวซึ่งแสดงว่าความแข็งของผิวเกิน 435 HV ไม่เป็นที่ยอมรับ
  • k ค่าถูกกำหนดที่อุณหภูมิการทดสอบ -20 ℃
  • l ใช้กับ d ≳ 16 mm
  • m ค่าสำหรับ KV กำลังอยู่ในระหว่างการสอบสวน
  • n แทนที่ ISO 6157-1, ISO 6157-3 อาจใช้ได้ตามข้อตกลงระหว่างผู้ผลิตและผู้ซื้อ

Surface Treatment

  • Zinc Electroplating : Electro-galvanization, is a process that applies a thin layer of zinc to the surface of metal parts, typically steel or iron, to protect them from corrosion. This process involves the use of an electrical current to deposit zinc from a solution onto the metal's surface. The zinc acts as a sacrificial anode, meaning it will corrode before the underlying metal does, offering protection even if the coating is scratched. Electro zinc plating is widely used in various industries, including automotive, construction, and electronics, for components that require a moderate level of corrosion protection at a relatively low cost.
  • Hot Dip Galvanizing : Hot-dipped galvanization is a process where metal parts, typically steel or iron, are submerged in molten zinc to apply a protective zinc coating that guards against corrosion. This method involves cleaning the metal surface through degreasing and fluxing, then dipping it into a bath of molten zinc, which results in a robust, abrasion-resistant coating. This technique is widely used for steel structures, outdoor furniture, fencing, and many other applications requiring durability and resistance to weather elements.