Vietnam, China or India for heavy fabrication

We source machine frames in Vietnam, so treat what follows with the scepticism that deserves. The useful version of this comparison is the one that says where Vietnam is genuinely weaker, because a buyer who finds that out after the PO has a worse problem than one who reads it here. The country is one decision among several in our guide to machine frame fabrication.

China: still the deepest capability

China has the largest heavy-fabrication base in the world, and for machine frames that shows up in three ways.

Equipment depth. Very large gantry mills, floor-type borers with 12 m travel, furnaces that take a 10 m part, 200-tonne cranes. If your frame is genuinely large, China has more shops that can build it than anywhere else by a wide margin.

Supply chain proximity. Plate, castings, linear rails, ballscrews, drives and fasteners are all local. A shop that needs a 90 mm plate in a hurry can often get one, which matters more than it sounds — material is usually the critical path, as plate availability is what sets your lead time sets out.

Price at volume. For repeat orders of the same frame, Chinese pricing is difficult to beat. The gap narrows at quantity one, where setup and engineering dominate and labour arbitrage matters less.

The reasons buyers look elsewhere are rarely about capability. They are tariffs, single-country concentration risk, and end customers — particularly in defence-adjacent, semiconductor and some medical supply chains — who now require a non-China option contractually.

Vietnam: the realistic position

Where it is genuinely good. A decade of investment aimed at export, much of it seeded by Japanese and Korean manufacturers who brought their quality expectations with them. Export orientation is the norm rather than the exception, ISO 3834-2 is common in shops that serve foreign customers, and English-capable engineering contacts are far easier to find than they were in 2015. Labour cost is below China. Ports at Cat Lai and Haiphong are well connected and the customs process for export manufacturing is mature.

Where it is genuinely weaker, and this is the part worth reading.

Very large capacity is thinner. Above roughly 6 m and 15 t, the number of Vietnamese shops that can fabricate, stress relieve, machine and lift a part drops sharply — and it is usually the furnace or the crane that binds, not the welding. Above that envelope, China simply has more options. The honest answer for a 9 m frame is often that Vietnam is not the right place for it, and we say so.

Material depth. Plate grades and thicknesses are less deeply stocked. Exotic grades are frequently imported, which adds weeks. This is why we push hard on grade equivalence and stocked thicknesses at drawing stage — see choosing a steel grade for a machine frame.

Cast components. Vietnam’s foundry base for large machine tool castings is limited. Hybrid designs with a large cast element often source the casting elsewhere, which reintroduces the coordination problem you were trying to solve.

Depth of the second tier. The best Vietnamese heavy-fab shops are genuinely good. The gap between the top tier and the next one down is wider than in China, which makes shop selection matter more. That is precisely why the audit in how to audit a heavy fabrication shop is not optional here.

Price. Expect roughly 8–15% above comparable Chinese pricing on machine frames, occasionally at parity on labour-heavy work. Buyers choosing Vietnam are generally paying a small premium for diversification, not saving money.

India: real and differently shaped

India has substantial heavy-engineering capability with a long history in power generation, process plant and machine tools, and an established machine tool industry of its own — which means shops that understand what a machine frame is for, rather than treating it as structural steel.

Strengths. Large fabrication capacity, strong engineering culture, widespread English, and competitive pricing. For very large or code-governed structures, Indian shops are well set up.

Weaknesses relative to Vietnam. Longer and less predictable ocean transit to both US coasts. Domestic logistics can be slow and variable. Quality variance across the supplier base is wide, and the gap between a good shop and a poor one is substantial — again making selection the dominant factor.

India tends to win on genuinely large, engineering-intensive one-offs. Vietnam tends to win on medium-sized repeat work where lead time predictability matters.

Others worth naming

Taiwan. Excellent machine tool ecosystem, high quality, higher cost. If the frame is small enough and precision is the priority, a strong option.

Turkey. Good heavy fabrication, well placed for European buyers on both freight and lead time, EN 1090 certification common.

Eastern Europe — Poland, Czechia, Romania. For European buyers, short lead times and no ocean freight often outweigh a higher unit price. Worth pricing before assuming Asia.

Mexico. For US buyers, USMCA treatment, short freight, and growing capability. Heavy-fab depth is thinner than Asia but improving quickly.

The general point: for a European or North American buyer, a nearshore option should be priced before an Asian one is assumed. Total landed cost including freight, duty, inventory and the cost of a six-week feedback loop sometimes favours a shop three hours away.

Choosing, honestly

Choose China when the part is very large, the volume is high, the supply chain needs to be local to the shop, and tariffs and concentration risk are acceptable to your customer.

Choose Vietnam when you need a credible non-China option, the part is within roughly 6 m and 15 t, lead time predictability matters, and you are willing to pay a modest premium for it.

Choose India when the part is large and engineering-intensive, and the transit time is tolerable.

Choose nearshore when lead time and iteration speed dominate, volumes are low, or your customer requires domestic or regional content.

What decides it more than geography

Across every one of these countries, the variation between shops is larger than the variation between countries. A top-tier Vietnamese shop outperforms a mediocre Chinese one on every axis that matters, and the reverse is equally true.

So the country decision is the smaller one. The shop decision is where the risk and the value sit — which is why the audit questions, the hold points and the documentation requirements in the rest of these notes matter more than picking the right flag. If the frame is built in house today, see make or buy a machine frame.

If you have a frame and want to know honestly whether it fits the Vietnamese heavy-fab envelope, send the drawing through. The feasibility note comes back within 24 business hours, and when a part is outside what the network can do well, that is what the note says.