How to Choose a Scrap Metal Shear: A Buyer’s Guide to Tonnage, Chamber and Duty
Buying a scrap metal shear is a ten-year decision. The wrong tonnage class leaves you either unable to process your heaviest material or paying for force you will never use. This guide walks through the six decisions that actually determine the right machine, in the order we ask about them when a buyer calls our Tangshan factory.
What a Scrap Metal Shear Actually Does
A shear is a cutting machine, not a compressing machine. It sizes charged material — HMS 1&2, plate, section steel, structural offcuts — by slicing it against a fixed blade with a moving box or blade arm driven by hydraulic cylinders. The finished cut is clean, dense and immediately furnace-ready, which is why shredder-free yards still run a shear at the head of the line.
Two numbers describe what a shear can take: the cutting force in tons, and the box or chamber size that decides how large a piece can physically enter. Both matter. A big box with insufficient force stalls on heavy plate; enormous force with a small box forces you to pre-cut everything by hand.
Step 1: Start From Your Heaviest Material, Not the Tonnage
The honest first question is not “how many tons do I need” but “what is the thickest, hardest piece that arrives at my gate?” Plate thickness and material grade set the floor. Turnings, thin sheet and light section can go on a smaller machine; HMS 1&2, crane rail and thick plate push the requirement up a class.
Write down the three heaviest items you process weekly. If those three items comfortably fit within a machine’s stated material capability, the tonnage is right. Our gantry shear range publishes the material capability for each model on its product page — compare your list against that table before anything else.
Step 2: Size the Tonnage on the Ladder
HUAXIN gantry shears run a clean ladder from 200 to 2000 tons. The ladder is not marketing decoration: each class exists because a distinct feed profile needs it.
| Class | Typical fit |
|---|---|
| 200–315 ton | Small yards, single-shift duty, light to medium steel scrap and thin plate |
| 400–630 ton | Commercial yards running two shifts, mixed HMS with section steel |
| 1000–1600 ton | Mid-size plants, heavy HMS, demolition contractors with structural steel |
| 2000 ton | Steel mills and high-volume yards, three-shift continuous duty on heavy feed |
Where you land inside a class depends on shift count more than on tonnage pride. A 630-ton machine run two shifts will comfortably out-produce a 1000-ton machine fed by one operator with a crane that cannot keep the box full.
Step 3: Chamber Size Decides Your Labor Bill
Two machines of equal tonnage can charge completely different material. The chamber or box opening sets the largest piece that enters in one bite. Every piece you must pre-cut by torch or hand saw is labor you pay for on every shift for the life of the machine.
Measure your three heaviest items from Step 1 and compare them with the chamber dimensions published on the product page. If the fit is marginal, go up a chamber size even at the same tonnage — the upgrade costs less than the labor it saves in the first year.
Step 4: Duty and Blade Life
Blade life is the number buyers forget. A shear cutting abrasive, contaminated feed wears blades faster than the same machine on clean HMS. Before ordering, be honest about your feed: if your material is mixed and often dirty, ask for the blade configuration and steel grade recommended for that duty rather than the standard build.
Shift count matters as much as material. Machines quoted for single-shift yards are not the same build as machines quoted for three-shift continuous duty — frame, cylinder seals and hydraulics all differ. Tell your supplier the real duty at quotation, not the duty you wish you had.
Step 5: Power Supply and Installation
Shear installations are heavy electrical projects. Motor ratings in this class commonly exceed what a small yard’s existing supply can start, and the starting method — direct-on-line, star-delta or soft start — must be matched to your transformer before the machine is built, not after it ships.
Confirm three things with your electrician before ordering: available supply voltage and frequency, spare capacity in kilowatts, and the physical route the machine will take into the building. Foundation drawings and electrical schematics ship with every machine; send them to your contractor the week the order is placed.
Step 6: Discharge, Feed and Downstream
A shear is only as fast as the crane that feeds it and the handling that clears its output. Before ordering, plan three flows: material in, cut scrap out, and where the cut pieces accumulate. A machine whose output piles up under the box will spend half its shift waiting.
Also decide who ties, stacks and loads. On busy yards the cut material goes straight onto a conveyor to a baler or a bunker; on small yards it is handled by the existing loader. Our team sizes the discharge arrangement against your layout during quotation — use that review.
When a Shear Is the Wrong Machine
Not every cutting job belongs on a gantry shear. Small shops processing rebar, short offcuts and light plate are usually better served by an alligator shear — a portable, lower-cost machine that needs no foundation and can even run on a diesel option. Yards whose main problem is bulky mixed waste that must be reduced to small, clean fraction are shredder customers, not shear customers.
The honest answer to “which machine” sometimes is “a smaller one, plus a different machine for the heavy stuff.” A two-machine setup that matches your actual feed will always beat one machine sized for your wish list.
Scrap Metal Shear FAQ
How do I know if my material is too thick for a 200-ton shear?
Compare your heaviest plate and section against the material capability table published on the product page. If your heaviest items sit at the top of the published range with no margin, move up a class — running at the limit shortens blade life and stresses the frame.
Can one shear handle both HMS and non-ferrous?
Yes for mixed steel-dominant feed. Non-ferrous such as aluminum and copper can be cut, but blade choice and chamber configuration should be specified for the mix you actually run. Send a material list with your inquiry and we will confirm suitability in writing.
What power supply do I need for a 630-ton shear?
Exact requirements are published on the product page and confirmed at quotation. Machines are built for 380 V, 400 V or 415 V at 50 Hz, or 60 Hz supply to order, and the starting method is matched to your site. Never wire a machine to a supply it was not built for — it voids warranty.
How long does delivery take?
Standard configurations ship in 30 to 45 days after the deposit clears. Non-standard chamber, motor or control combinations run 60 to 75 days, and the exact date is confirmed in writing with the order.
Do you help with installation?
Every machine ships with leveling instructions, electrical schematics and the hydraulic diagram, and we send a commissioning engineer for leveling, electrical connection, no-load and load runs and operator training. Remote commissioning is available on repeat configurations.
Talk to the Factory Before You Decide
Send us your heaviest material, your shift pattern and your site supply, and we will recommend the tonnage class and chamber size against real data — including telling you when a smaller machine is the honest answer. Quotations come back within two business days, factory direct, with the specification sheet you can hand to your electrician and foundation contractor.
Ready to shortlist? Start at the scrap metal shear range or contact our team with your material list. For small workshops and portable duty, compare the 250-ton alligator shear as well.