THE MECHANICAL PROPERTIES OF SCM430 ROUND BAR

 SCM430 is a chromium-molybdenum alloy steel as per Japan Standard. JIS SCM430 steel contains a lower carbon content but provides better weldability comparing with SCM440 Steel. SCM430 round bar is frequently applied to the gas & oil area.Typical applications include components such as valve  bodies,pumps and hydraulic cylinder fittings like cylinder rod.

Chemical Composition
National
Standard		GradeC%Si%Mn%Cr%Mo%P%S%
DIN25CrMo4
(1.7218)		0.22-0.29≤0.40.6-0.90.9-1.20.15-0.3≤0.025≤0.035
AISI/SAE41300.28-0.330.15-0.350.4-0.60.8-1.10.15-0.25≤0.035≤0.04
JISSCM4300.28-0.330.15-0.350.6-0.850.9-1.20.15-0.3≤0.035≤0.04
GB30CrMo 0.26-0.34 0.17-0.37 0.4-0.7 0.8-1.1 0.15-0.25 ≤0.035 ≤0.035

SCM430 ROUND BAR FORGING

Forging temperature of AISI 4130 steel should be carried out between 950℃-1200℃,The lower the forging-ending temperature ,the finer the grain size .Hold suitable time for the steel to be uinformly heated before forge, but don’t forge below 950℃.AISI 4130 steel should be cooled as slowly as possible after forged.

SCM430 ROUND BAR HEAT TREATMENT

4130 Annealing

AISI 4130 steel can be annealed to relieve stress after forging ,and obtain a good structure suitable for machining,Annealing temperature should be carried out between 800℃-850℃, hold suitable time for the steel to be heated uniformly. Cool slowly in the furnace.

4130 Normalizing

Normalizing is used to refine the structure of forgings that might have cooled non-uniformly after forged,and considered as a conditioning treatment before final heat treatment.Normalizing temperature for AISI 4130 steel should be carried out between 880℃-900℃. hold suitable time for the steel to be uniformly heated to complete the ferrite to austenite transformation.Cool in still air.

4130 Tempering

Tempering is usually carried out to relieve stresses from the hardening process, and will optimize hardness and mechanical properties. The actual tempering temperature will be chosen to meet the required properties.Heat the AISI 4130 carefully to a suitable temperature ,usually between 400℃-570℃, soak at the temperature for 2 hours per 25mm of ruling section, then cool in air.The lower the tempering temperature the greater the strength. However, Tempering between 250-375°C is not advised as tempering within this range will seriously reduce the impact value.

Hardening of SCM430 Round Bar

This heat treatment will obtain martensite structure after quenched,it will increase the surface hardness and strength.AISI 4130 steel should be carried out between 870℃-890℃, hold suitable time for the steel to be thoroughly heated, then quench in oil, or water.Tempering should be followed immediately after quenched.

Datong Hydraulic as a professional steel tubes and rods manufacturer,we have rich experience in the production and export for SCM430 round bar , we also supply 4140 4130 4340 hard chrome cylinder rod ,hollow chrome bar, induction hardened rod for all size. Contact us now for more informations.

Comments

Post a Comment

Popular posts from this blog

40CR ALLOY STEEL SPECIFICATION

  40Cr steel  is a kind of Chinese GB standard alloy steel for engineering and machinery purpose, and one of the most widely used steel grades. For 40Cr material hardness, specifications and equivalent, please see the table below. After quenching and tempering treatment, 40Cr steel has good comprehensive mechanical properties, low temperature impact toughness, low notch sensitivity, good hardenability, and high fatigue strength in cold oil. When water cooling, the complicated shape of the parts is prone to cracks, the cold bending plasticity is medium, and the cutting workability after normalizing is good, but the weldability is poor, should be preheated before welding, and is generally used in the state of quenching and tempering. DATASHEET & SPECIFICATION The tables below list 40Cr alloy steel datasheet and specification including chemical composition, properties and heat treatment, etc. 40CR STEEL CHEMICAL COMPOSITION   Chemical Composition (%) Grade C % Si Mn Cr 40Cr 0.37 – 0.4
Read more

Skiving &Roller Burnishing Tube And Honing Tube

Image
Skiving and roller burnishing tube  process provide high quality hydraulic cylinders with final sizing and creates the desired finish pattern on the interior of tubing or cylinder bores. They are used in the manufacturing of  hydraulic cylinders . Compared to honing process, they are 80-90% saving of machine time which reduces tool costs per meter of tube length and produces super finish surface, with a bore tolerance of IT8, thereby reduces the sealing wear making it ideal for pistons. The skiving tool is a multifunctional tool used in the manufacturing of hydraulic cylinders. Skiving is operated like this: Two thin chips are cut at a high feed rate (1-4 mm/rev) while the tool passes through the work piece. This cutting operation determines the finished diameter and tolerance of the hydraulic tube. Surface finish Ra= 4-10 μm (skiving) Skiving has obvious advantages compared with honing: • 80-90% saving of machine time which reduces tool costs per meter of tube length. • Produ
Read more

What is Hydraulic Ram Cylinder?

Image
  Hydraulic ram cylinders   are typically used to give vertical motion, including lifting loads in a vertical direction. Such a cylinder is also used to provide the motion in a horizontal direction but needs attention and suitable guides to guide the motion. Single-acting hydraulic cylinders that have no pistons but have large  cylinder rod s are called rams. These rams operate exactly like the conventional single acting hydraulic  cylinders. However, they use large diameter rods in place of pistons and piston seals in their designs. Thus, in place of pistons, rams have high-pressure cap-end ports. They also do not have any low-pressure rod-end ports. Rams are generally cheaper than their conventional single-acting cylinders counterparts.
Read more