Senda Group Co.，Ltd

SENDA for metal processing solutions.

A.ESR raw material

The largest metal ingot can reach 3 tons in SENDA factory. The ingot obtained by this remelting/refining process is very homogeneous and free of internal defects. The segregation of the ingot (called macro-segregations ) are substantially eliminated and the segregations of crystals (called macro-segregations) are significantly reduced.

The ESR remelted material enhance following mechanical characteristics:
a. Improved toughness due to increasing homogeneity and isotropy
b. Improved creep resistance properties
c. Better fatigue strength and tenacity properties as well as outstanding tensile strength
d. Improved purity

B. Forging ALL the blades

The largest electro-hydraulic hammer is 4.5 ton, with more than 6 skilled workers. After forging, the inside microstructure grow much closer and the metal grain size becomes much smaller. It can elevate the characteristics and quality of the blade, ensuring a longer life.

C. Professional heat treatment technology

SENDA has independent workshop for heat-treatment process with couples of skilled technicians. Actually, most blades ( thickness ≤100mm) can be fully hardened. Thus, the blades can be used after repairing until the size reached the Min. design dimension. 

Below are Vaccum type and salt-bath type heat-treatment:

salt-bath type:

2. SENDA accept third party inspection , SGS, ITS etc.

To improve the customer experience and maintain strict standards of product quality, SENDA introduced SGS third party to escort the product quality. Through strict inspection and testing, product, process, system and service in accordance with national and international regulations and standards.

3. SENDA has complete quality feedback system.

SENDA takes responsibility for any failure caused by us, and reproduce new blades for you for free. But we seldom receive claim about the quality of our products. Before the delivery, we all check the quality for every piece of blades. We will never send out products with problems.

4. SENDA also provide analysis and solutions for shear problems. 

We can provide technical service from our engineer to assist you in realizing a high quality output, according to the on-site working experience.

Main Production Facility：

• CNC Surface Grinding Machine : Max 6000 mm Length
• Surface Grinding Machine : Max 3000 mm Length
• Electric Furnace : Max 3600mm, 1100mm Lenght
• Plano Miller : Max 4000mm Lenght
• Cylindrical Grinding Machine : Max Outside Diameter Ø900 mm
• CNC Rotary Grinding Machine : Max Outside Dimeter Ø508 mm
• Rotary Grinding Machine : Max Outside Diameter Ø700 mm
• Universal Grinding Machine : Max Outside Diameter Ø900 mm
• SANSEI Grinding Machine : Max Oustside Diameter Ø508 mm

Factory Tour: 

Laying-off: selecting raw material​

Forging: enhance the density and consistency

Annealing: increase the ductility and reduce the hardness

Machining: to be shaped into an intended design

Packaging

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From Steel-making to Finishing Process and test, all steps are carried by SENDA.

Testing and inspection can accurately control the product quality. SENDA has recently introduced advanced inspection and testing equipment such as German advanced spectrum analyzers to strictly control product quality and resolutely prevent the flow of unqualified products to the market, which improves the production efficiency and obtains customer’s approval of praise and trust!

Main Inspection Equipment：

• Height Gauge
• Electronic Micrometer, Micrometer, Vernier Calipers
• Three Demension Coordinate Measuring Machine
• Inside Diameter Cylinder Gauge
• Fatigue Testing Machine
• Impact Testing Machine, etc
• Magnetic Particle Testing Equipment
• Micro Vikers, Rockwell, Equotip, Ultrasonic Hardness Testers

Tolerance Measurement, for slitting blade, the customer's

precision requirements is within 0.0005mm, SENDA adopt a series

of thickness tolerance measuring instruments, with automatic reading

fuction, that is convenient and efficient for the measure of tolerance,

so as to meet the customer's tolerance requirements.

is used for the detection of inherent defects such as cracks,

inclusions, or other discontinuities in metals, ceramics and

composite materials. Another widespread application in

ultrasonic NDT is weld seam testing.

Hardness testing equipments. 

Scientific and reasonable Chemical composition matching in SENDA lab: 

Besides regular elements, proper percentage of elements are added into our products. For the sake of fast composition analyses, the company has invested amount of capitals and energy for testing equipment. 

Tungsten Carbide (TCT)

M51

SKH-51

LD (7Cr7Mo2V2Si)

SKD-11/D2/K110（Cr12Mo1V1）

H12（3Cr5WMoVSi ）

H13 (4Cr5MoSiV1)

H13K (4CR5MOSIV1)

Advanced smelting process

The company chooses medium-frequency induction furance to melt raw materials. During this process, lots of impurities and harmful gas are filitered out. The final raw material are pure and without casting segregation.

Strict and Accurate temperature control process

based on more than 20 years production experience, the company worked out a strict temperature control criteria and professional inspectors.

Advanced heat treatment process

Professional heat treatment can make steel performance achieved. The company earns advances equipments and skilled engineers and workers. Excellent heat treatment technology is our core competence and bring our products famous at home and overseas.