China Hot selling Alloy Steel Round Bar Grade 4340 / 40CrNiMoA/Sncm439 Alloy Steel Shaft brass screw shaft

Product Description

Alloy Steel Round Bar Grade 4340 / 40CrNiMoA/SNCM439 Alloy Steel Shaft

Products Alloy Steel Round Bar
Diameter 13 – 300mm
Length  6m or custom cutting as request
Grade  4340 Alloy Steel
Our Service Cutting , polishing, packing, heat treatment
Brand BAOSTEEL , HangZhou, DSS,ZheJiang , XNSS,HLXT.etc
Standard GB , ASTM , JIS , EN , DIN
Company Type storgae company and process service

AISI 4340 steel (UNS G43400) is an ultra-high strength medium carbon low alloy steel, which combines deep hardenability, high ductility, toughness and strength, and has high fatigue resistance and creep resistance. It is not particularly affected by tempering and embrittlement, and exhibits good strength retention at high temperatures and is not easily softened. In thin sections, this steel is air-hardened. In practice, it is usually oil quenched.

Chemical Composition of 4340 Alloy Steel

AISI 4340 steel material chemical composition is listed in the following table based on cast analysis.

4340 Chemical Composition, %
ASTM Steel Grade (UNS) C Si Mn P (≤) S (≤) Ni Cr Mo Notes
ASTM A29/A29M 4340 alloy steel (UNS G43400) 0.38-0.43 0.15-0.35 0.60-0.80 0.035 0.04 1.65-2.00 0.70-0.90 0.20-0.30 Steel Bars, Carbon and Alloy, Hot-Wrought
ASTM A322 Steel Bars, Alloy, Standard Grades
ASTM A519/A519M Seamless Carbon and Alloy Steel Mechanical Tubing
ASTM A646/A646M Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

 

Mechanical Properties of 4340 Alloy Steel

4340 steel mechanical properties are listed in the following tables.

AISI 4340 Mechanical Properties
Steel Condition Tensile strength, MPa (ksi), ≥ Yield strength, MPa (ksi), ≥ Elongation in 50 mm (2 in.), ≥ Reduction in area, %, ≥ Hardness, HB, ≤
4340 Normalized at 870 °C (1600 °F) 1282 (186) 862 (125) 12.2 36.3 363
Annealed at 810 °C (1490 °F) 745 (108) 470 (68) 22.0 50.0 217
Oil quenched from 800 °C (1475 °F) and tempered at 540 °C (1000 °F) 1207 (175) 1145 (166) 14.2 45.9 352

Applications of 4340 Alloy Steel

SAE AISI 4340 steel is usually used in places where severe conditions exist and heavy parts requiring high strength, and can be widely used as billet, bar, bar, forging, sheet, pipe and welding wire. AISI 4340 steel can also be produced as light plates and castings. Typical applications include bolts, screws and other fasteners. Gears, pinions, shafts and similar mechanical components; crankshafts and piston rods of engines; and landing gear and other key structural components of aircraft.

Equivalent of 4340 Alloy Steel

ASTM AISI 4340 steel equivalent to SAE, European (German DIN, British BSI, France NF), Japanese JIS and Chinese GB standard (for reference).

AISI 4340 equivalent
US European Union China Japan ISO
Standard Grade (UNS) Standard Grade Standard Steel name (Steel number) Standard Grade Standard Grade Standard Grade
AISI
SAE;
ASTM A29/A29M;
ASTM A322;
ASTM A519/A519M;
ASTM A646/A646M
4340 (UNS G43400) SAE AMS6414     GB/T 3077 40CrNi2Mo JIS G 4053 SNCM439    

Company Informations

Our company’s main material of all kinds of round steel, ling Steel, CHINAMFG Steel, Benshan Steel, Tiangang, ZheJiang Luli steel, HangZhou steel, Professional, HangZhou, Laigang, HangZhou steel and other major steel mills all kinds of excellent special steel designated agents in ZheJiang , monthly sales of all kinds of steel 40,000-60000 tons.

We have more than 4 warehouse for stock our bars.  About 30 grade of products keep in stock long time, more than 800 size ensure the short deliver time for clients.

We have a warehouse specially for steel round bar processing, include cutting, polishing, heat treatment.etc

The company’s sales network throughout the world, products are widely used in a variety of machinery, standard parts, automobiles, gears, forging, hardware tools and other industries.

We manufacture the following popularly used grades:

EN19, EN24, EN25, EN26, EN30, EN31, EN36C, EN39, EN 40, EN41B, EN42, EN9, EN14A, EN15, EN16, EN18, EN47, EN100, EN351, EN353, EN354, EN355, C22E, C25E, C30, C35E, C45, CK45, C50, C55, C60, S45C, S235J2, S275J2, S355J2, ST52.3, C35E, C45R, 35B2, 28Mn6, 46Cr2, 34Cr4, 41Cr4, 20Mn5, 42CrMo4, 50CrMo4, 30CrNiMo8, 34CrNiMo6, 36CrNiMo4, 36NiCrMo16, 51CrV4 27MnCrB5, 32CrB4, 25CrMo4, 20MnCr5, 16MnCr5, 16MnCrS5,17CrNiMO6, 18CrNiMo7, 20MnB4, 23MnB4, 23MnB3, 34CrMo4V, SS410, SS416, SS420, SS431, SCM420, SCM440, 13Ni13Cr3, 15Ni16Cr5, 36Si7, 40Cr4, 15Ni5Cr4Mo1, 15Ni7Cr4Mo2, 16Ni8Cr6Mo2, 36Si7, 37C15, 35Mn6Mo3, 40Ni6Cr4Mo3, 40Ni10Cr3Mo6, 55Si7, 50Cr4V2, 25Cr13Mo6, 10C8S10, 14Cr14S14, 25C12S14, 40C10S18, 11C10S25, 40C15C12,
SAE 1571, SAE1571, SAE1030, SAE 1035, SAE 1040, SAE 1117, SAE1541H, SAE4130, SAE4135, SAE4140, SAE4145, SAE4145H, SAE 4330, SAE 4340, SAE 4820, SAE5160, SAE8620, SAE 8630, SAE8640, SAE52100, SAE9310, AISI1571, AISI1571, AISI1030, AISI 1035, AISI 1040, AISI 1117, AISI1541H, AISI 4130, AISI4135, AISI4140, AISI4145, AISI4145H, AISI 4330, AISI 4340, AISI4820, AISI 5160, AISI 8620, AISI 8630, AISI 8640, AISI 9310
BS970 080A15, 080M15, 070M20, 080A30, 080M30, 080M40, 080A42, 080A47, 080M50, 070M55, 150M19, 150M36, 045A10, 045M10, 080M15, 210M15, 635M15, 637M17, 655M13, 665M17, 805M17, 805M20, 815M17, 820M17, 822M17, 835M15, 530M40, 605M36, 606M36, 708M40, 709M40, 722M24, 817M40, 826M31, 826M40, 945M38, 410S21, 416S21, 416S29, 420S29, 420S37, 431S29
EN 10088-3 X12Cr13, X20Cr13, X30Cr13, X17CrNi16-2
ASTM A105, ASTM A182 F5, ASTM A182 F9, ASTM A182 F11, ASTM A182 F12, ASTM A182 F22, ASTM A182 F91, ASTM A182 F92, ASTM A350 LF2, ASTM B16, ASTM A193 B7, ASTM A193 B16, ASTM A266 Grade 1-2-3 and 4, ASTM A29 all grades, ASTM A540 B21, ASTM A540 B22, ASTM A540 B23, ASTM A540 B24, ASTM A540 B24V
X22CrMoV121, 21CrMov57, 40CrMoV4-6, 27NiCrMoV15-6, 26 NiCrMo 14-6, 20CrMoVTiB4-10, X19CrMoNbVN11-1, X10CrMoVNb9-1
DIN 1.2714/DB6, DIN1.2343/AISI H11, Din 1.2344/AISI H13
GOST 4543-71 33XC, 38XC, 40XC, 45XH, 30XH3A, 12X2H4A, 20X2H4A, 20X2H4MA, 18X2H4MA, 30XGCA, 40ХН2МА, 40Х2Н2MA, 30ХН2МА

 

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Type: Alloy Steel Bar
Standard: ASTM
Technique: Hot Rolled
Application: Tool Steel Bar
Surface Treatment: Polished
Alloy: Alloy
Samples:
US$ 10/Piece
1 Piece(Min.Order)

|
Request Sample

screw jack

What advancements in screw jack technology have improved efficiency and reliability?

Advancements in screw jack technology have led to significant improvements in efficiency and reliability. Here are some key advancements that have contributed to these improvements:

  • High-Efficiency Ball Screws: Traditional screw jacks often used trapezoidal or square threads, which had relatively lower efficiency due to higher friction. However, the introduction of high-efficiency ball screws in screw jack designs has greatly improved efficiency. Ball screws offer low friction and higher efficiency, resulting in reduced power consumption and improved overall system efficiency.
  • Improved Lubrication Systems: Proper lubrication is crucial for the smooth operation and longevity of screw jacks. Advancements in lubrication systems, such as the use of self-lubricating materials, improved lubricants, and better sealing mechanisms, have enhanced the reliability and maintenance intervals of screw jacks. These advancements minimize wear, reduce friction, and ensure consistent performance over extended periods.
  • Materials and Coatings: The use of advanced materials and coatings has significantly improved the durability and reliability of screw jacks. Components made from high-strength alloys, such as stainless steel or hardened steel, can withstand higher loads and resist wear. Additionally, coatings like zinc plating or epoxy coatings provide corrosion resistance, extending the lifespan of screw jacks in challenging environments.
  • Integrated Sensors and Feedback Systems: Integration of sensors and feedback systems in screw jacks has improved their reliability and control. Position sensors, load sensors, and torque sensors can be integrated into screw jacks to provide real-time feedback and monitoring. This enables precise positioning, load measurement, and the ability to detect and respond to abnormal operating conditions, ensuring safe and reliable operation.
  • Automation and Control Integration: The integration of screw jacks with advanced automation and control systems has improved efficiency and reliability. Motorized screw jacks can be integrated with programmable logic controllers (PLCs) or computer numerical control (CNC) systems, enabling precise and synchronized movements, remote operation, and automation. This integration minimizes human error, enhances repeatability, and optimizes the overall efficiency of screw jack systems.
  • Design Optimization: Advancements in computer-aided design (CAD) and simulation tools have allowed for the optimization of screw jack designs. Finite element analysis (FEA) and virtual prototyping enable the evaluation and refinement of various design parameters, resulting in improved load-bearing capabilities, reduced weight, and enhanced structural integrity. These design optimizations contribute to increased efficiency and reliability.

These advancements in screw jack technology have collectively improved efficiency, reliability, and overall performance. Manufacturers continue to innovate and refine screw jack designs to meet the evolving needs of various industries, ensuring that screw jacks remain a reliable and efficient solution for lifting and adjusting loads.

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What safety precautions should be followed when operating screw jacks?

Operating screw jacks safely is essential to prevent accidents, injuries, and damage to equipment. Here are some important safety precautions that should be followed when operating screw jacks:

  • Read and Understand the Manual: Before operating a screw jack, carefully read and understand the manufacturer’s instruction manual. The manual provides important safety information, operating procedures, and maintenance guidelines specific to the screw jack model. Following the manufacturer’s instructions is crucial for safe and proper operation.
  • Inspect the Screw Jack: Prior to use, inspect the screw jack for any signs of damage, wear, or loose components. Check for proper lubrication and ensure that all connections and fasteners are secure. If any issues are identified, do not operate the screw jack and address the problems through maintenance or contact the manufacturer for assistance.
  • Use Appropriate Personal Protective Equipment (PPE): When operating a screw jack, wear the necessary personal protective equipment (PPE) as recommended by the manufacturer and applicable safety regulations. This may include safety glasses, gloves, steel-toed shoes, or other protective gear depending on the specific application and work environment.
  • Ensure Stable Support: Place the screw jack on a stable and level surface capable of supporting the load. Ensure that the supporting structure or surface is capable of withstanding the forces generated during the lifting or lowering operation. Use appropriate blocking or shoring if additional support is required.
  • Do Not Exceed Load Capacity: Never exceed the load capacity specified by the manufacturer for the screw jack. Overloading the screw jack can lead to instability, component failure, or other safety hazards. It is important to know the weight of the load being lifted or supported and select a screw jack with an appropriate load rating.
  • Operate Smoothly and Carefully: Operate the screw jack smoothly and carefully, avoiding sudden or jerky movements. Use the operating handle or control mechanism provided by the manufacturer and follow the recommended operating procedures. Maintain control over the lifting or lowering process, and ensure that personnel or body parts are clear of pinch points or potential hazards.
  • Do Not Use as a Permanent Support: Screw jacks are not designed to be used as permanent supports or to sustain constant loads over extended periods. They are intended for intermittent or temporary use. Avoid using screw jacks as permanent supports or in situations where prolonged load-bearing is required.
  • Properly Store and Maintain: After use, properly store the screw jack in a clean and dry environment. Follow the manufacturer’s maintenance guidelines for lubrication, inspection, and periodic maintenance. Regularly check the screw jack for any signs of wear, damage, or deterioration, and address any issues promptly.
  • Training and Competence: Ensure that operators are adequately trained and competent in the safe operation of screw jacks. Training should cover proper use, maintenance, and understanding of the associated hazards and safety precautions.

Following these safety precautions when operating screw jacks promotes a safe working environment and helps prevent accidents or injuries. It is important to prioritize safety and adhere to the manufacturer’s guidelines and industry best practices.

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Which industries and sectors commonly rely on screw jacks for their operations?

Screw jacks find applications in various industries and sectors where lifting heavy loads, adjusting height, or precise positioning is required. Here are some of the industries and sectors that commonly rely on screw jacks for their operations:

  • Manufacturing: Screw jacks are extensively used in manufacturing industries for tasks such as lifting and positioning heavy equipment, adjusting assembly line heights, and aligning components during production processes.
  • Construction: The construction industry utilizes screw jacks for tasks like lifting and stabilizing structural elements during building construction, adjusting formwork and scaffolding heights, and positioning heavy machinery or materials.
  • Automotive: In the automotive sector, screw jacks are employed for lifting vehicles during maintenance and repairs, adjusting conveyor heights in assembly lines, and positioning components during manufacturing processes.
  • Transportation and Logistics: Screw jacks are used in transportation and logistics for tasks such as adjusting loading dock heights, raising or lowering platforms on trucks or trailers, and positioning cargo handling equipment.
  • Entertainment and Events: The entertainment and events industry relies on screw jacks for stage setups, lifting and adjusting lighting equipment, raising or lowering platforms for performers, and creating dynamic stage effects.
  • Aerospace and Defense: Screw jacks are utilized in the aerospace and defense sectors for applications such as adjusting heights of launch platforms, positioning aircraft components during assembly, and operating heavy-duty doors or hatches.
  • Material Handling and Warehousing: Screw jacks are found in material handling and warehousing operations for tasks like adjusting conveyor heights, lifting heavy pallets or containers, and positioning racks or shelves.
  • Mining and Heavy Machinery: The mining industry and sectors involving heavy machinery utilize screw jacks for lifting and positioning equipment, adjusting conveyor heights, and supporting heavy loads in various mining operations.
  • Energy and Utilities: Screw jacks are employed in energy and utility sectors for tasks such as adjusting heights of solar panels or wind turbines, raising or lowering equipment in power plants, and positioning components in utility infrastructure.
  • Medical and Rehabilitation: In the medical and rehabilitation fields, screw jacks are used for height adjustment of medical beds, positioning of imaging equipment, and providing adjustable support systems for patients.

This list is not exhaustive, and screw jacks may find applications in other industries and sectors beyond those mentioned. The versatility, load capacity, and precise control offered by screw jacks make them valuable tools in a wide range of operations requiring lifting, adjusting, or positioning heavy loads.

China Hot selling Alloy Steel Round Bar Grade 4340 / 40CrNiMoA/Sncm439 Alloy Steel Shaft   brass screw shaftChina Hot selling Alloy Steel Round Bar Grade 4340 / 40CrNiMoA/Sncm439 Alloy Steel Shaft   brass screw shaft
editor by CX 2024-04-11