Custom Forged Pinion Gear Shaft Manufacturer | 18CrNiMo7-6 Gearbox Shaft Supplier | HHF

Custom Forged Pinion Gear Shaft Manufacturer | 18CrNiMo7-6 Gearbox Shaft Supplier | HHF

HHF‍‌‍‍‌ produces forged steel pinion gear shafts used in industrial gearboxes, mainly made from 18CrNiMo7-6 alloy steel. Diameters vary from 120mm to 1200mm with applications for heavy equipment, wind turbines, and marine propulsion systems.

We can produce the gears either according to your customer specifications provided as drawings or develop technical drawings ourselves in case you would like a new design of the gearing.

Pinion Gear Shafts Fail Under Load: Here Is How HHF Prevents It

A pinion shaft is that component of the machinery which is seldom noticed or thought of by the operators or even the maintenance team until something goes drastically wrong. It is housed in the gearbox, where in addition to its primary job of transmitting the power, it also takes whatever the drivetrain can do to it without a complaint, at least in a healthy and well-maintained state. Failure of gear shaft often presents with quite familiar symptoms: cracking of tooth root, surface pitting of teeth, or a gear shaft whose deflection greatly exceeds acceptable limit under high torque.

In all the failure case analyses and discussions we have been involved with, the engineering and the drawing of the gearbox were not usually at fault. The core of the problem lay mostly in the material characteristics and the process used to convert raw metal into functional shafts. The core toughness was not enough. The hardness was fine on the very thin surface layer but fell very quickly underneath the case. The non-metallic inclusions became micro-cracks where fatigue started to spread.

18CrNiMo7-6 alloy, a steel grade with outstanding hardenability, core properties, good resistance to wear and fatigue, is a perfect combination of qualities that a gear mechanism under heavy load would require.

We forge gears on a 10,000-ton hydraulic press, then use a heat treatment that is adjusted to the section size rather than being done for the same length all the way around. We perform chemical composition tests, mechanical properties testing, and hardness checks in our National Class II lab on each batch.

At any time you have a doubt, before placing an big order, ask for sample inspection reports or come see a visit to the lab.

Advantages of HHF Forged Pinion Gear Shaft

The first point is that diameter range, covering the industrial gearbox sizes from 120mm to 1200mm, eliminating the need for your redesign. Secondly, 18CrNiMo7-6 is a high-alloy steel, the gear steel, not a substitute for other types. Core strength and case hardness are properties that work in harmony similar to how a gearbox really works.

Third, we start the process with your drawing. The drawing from your engineer will be the main thing to base on to produce the gear shaft, not the other way around. Fourth, if you also need a design solution we can design the shaft, drawing, of which gear is in mechanical drawings specifications and operating conditions, saving on both your time and costs. Lastly, internal quality control, i.e. chemical composition, mechanical properties and hardness are measured right here, that would not delay the process of getting outside report.

Creating unique gear shaft solutions

Your application will dictate the requirements of your gear shaft. Different types of gear box shafts such as the one in a wind turbine face completely different load patterns from a marine drive shaft or a mineral equipment drive shaft. We get our engineering team involved as soon as you send us the technical details, the conditions under which the shaft is meant to operate or even the physical measurements needed and they come up with the perfect combination of material and the heat treatment condition to suit your specific needs. In case you already possess a drawing, our engineers can use the drawing to produce. You might, however, require a drawing to be developed before production in which case, our engineering team is the resource to be called upon and can carry out the task efficiently. Customers can also choose from different materials, besides 18CrNiMo7-6 material, based upon the requirements as specified by the customer ‍‌‍‍‌itself.

Chemical Composition of 18CrNiMo7-6

H ≤ 1.8 ppm
Hardness ≤ 250 HB

The materials can be selected according to customer requirements.

Quality‍‌‍‍‌ Control You Can Verify

Quality is not a claim here; it is a set of results.

We have in-house National Class II laboratory. It conducts accurate chemical composition analysis, property testing of mechanical properties of metal materials, and hardness testing, etc. A batch always ships with its inspection records

Our Quality assurance certification and conformity to quality management system has helped us to deliver superior quality in performance, reliability and durability of forged pinion gear shafts on the long run. If you would like to have a look at these quality inspection reports first, just request one or come and see our lab directly.

Warranty and After Sales

Each of our factory made forged pinion gear shafts is delivered with a 12-month warranty which covers manufacturing defects in material, forging as well heat treatment.

The manufacturer reserves the right to determine whether a product qualifies as a repair, replacement, or refund during the warranty period. Technical questions will get reply no later than at the next working day. We can coordinate a joint inspection with SGS or BV representatives.

In order to facilitate you in reordering or manufacturing spare parts, we maintain detailed production and inspection records of every order so that the product specifications remain exactly the same without redrawing or reengineering anything.

Logistics and Delivery

We carry heavy and oversized gear shafts which often require advanced transport arrangements. We can deliver to your Port or can let our container be loaded directly at our factory, which reduces packing and handling costs and gives you a full view of the loading process. Port delivery includes major Chinese seaports such as Shanghai, Ningbo, Tianjin, Qingdao and Guangzhou, subject to packing terms as per the selected Incoterms. With the container being loaded directly at the factory, you can see the loading process.

We operate under FOB, CIF, and DAP terms and can also work with your preferred freight forwarder on documentation, delivery date, and unloading arrangements.

Payment Conditions

The payment condition is 30% by the buyer for the work commencement and the rest 70% before the delivery. To those with good track records of placing orders regularly, we can offer sight L/C or a partial payment with the bill of lading. Both T/T and L/C terms are negotiable.

About HHF

The Henan Zhongyuan Heavy Forging Company Limited (HHF), an established heavy forging manufacturer of China, was founded in November 2004 by our company which located Jiyuan City, Henan Province. Henan Heavy Forge is an innovation-based company designated as one of China's High-Tech Enterprises (National Level).

With a production area of about 150,000 square meters the company has: three large open-die forging production lines based on a 10000-tonne hydraulic pressure machine (hammer), besides two other small forging production lines as well as large CNC machining centers, heat treatment lines and also a physical & chemical test lab at 2nd level. In a year approximately 50,000 tons of large forgings can be made from the company with single pieces often more than 30 tonnes weighing.

Hiring 500 personnel, including R&D staff numbering over 50 engineers and technical specialists, the main areas of work involve new materials, methods and technologies.

HHF holds certificates: API Q1, API 7-1 (drill collar and stabilizer logo certification), CSSC, ISO 9001:2008, and ISO/TS29001.

Supplying power generation (wind, water, and thermal) equipment leaders; mining machinery; shipbuilding; and heavy equipment industries at home and abroad through our long-term supply network. Some of the local clients are CITIC Heavy Industries, China First Heavy Industries, Taiyuan Heavy Industry, Goldwind, and Envision Energy. HHF is also supplying to a range of foreign mining equipment manufacturers such as Joy Global,Hitachi Mining, Komatsu and Caterpillar. Our product is also being exported to more than 20 countries and ‍‌‍‍‌regions.

Frequently Asked Questions

How soon can I get a quotation?
Usually within 3 working days. We need your requirements and main dimensions.

How is quality controlled?
A dedicated QA team follows production from raw material receiving through shipping. Chemical composition, mechanical properties, and hardness are tested in our National Class II laboratory.

Can I visit your factory?
Yes. We will arrange for our technical team to meet you and go through requirements in person.

What is the production lead time?
Forging, rough machining, Q+T, final machining. Normally 45 days.

What are your payment terms?
30% down payment to start, 70% before delivery.

What material is used for these gear shafts?
18CrNiMo7-6 is the standard grade. Other materials can be selected according to your requirements.

What is the maximum diameter you can forge?
Outer diameters range from 120mm to 1200mm. If your shaft falls outside this range, send us the drawing and we will confirm feasibility.

Can you develop drawings if we do not have them?
Yes. Our technical team can design and produce custom gear shaft drawings based on your mechanical specifications and operating conditions.

Do you provide test reports with the shafts?
Yes. Chemical composition, mechanical properties, and hardness test reports ship with the goods.

Which ports do you ship from?
Shanghai, Ningbo, Tianjin, Qingdao, and Guangzhou. Factory loading is also available.

Ready to Start Your Gear Shaft Project?

Send your drawing, material grade, dimension, and quantity through the inquiry form below. Our engineering team will review it and come back with a quotation within three working days. If the project is still early and you do not have everything ready, send what you have and we will help move it forward. Material selection, heat treatment condition, and inspection standards are all open for discussion before you lock the spec. Fill in the form at the bottom of this page, and we will tell you exactly what we can do and how we will verify it.

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