As a premium high-molybdenum hot-work tool steel, 1.2367 (X38CrMoV5-3) offers superior elevated-temperature strength, excellent thermal fatigue resistance, and high temper resistance compared to standard H13. Produced through our in-house EFS/ESR route and 8-step quality inspection, it is ideal for extreme die-casting and hot forging applications.
01
Cavity blocks, cores and heavy inserts take a thermal cycle thousands of times over, and on large castings the face reaches temperature faster than the block behind it can follow. That gradient, repeated, is what opens a crack network across a die face while the steel elsewhere is still sound.
02
Dies, mandrels, bolsters and dummy blocks sit hot continuously rather than cycling, so the demand shifts from resisting a cycle to holding strength and hardness at a sustained working temperature over a long run between reconditioning.
03
Particularly in the larger sections, and in inserts that see both impact and heat in the same stroke.
Beyond those, the grade appears in hot shear blades and in extrusion tooling for non-ferrous metals wherever a shop has already replaced the same tool twice for the same reason.
Both grades are 5% chromium hot work steels with much the same carbon, and on a summary table they look adjacent. Two numbers separate them.
| Element | 1.2367 | H13 tool steel |
|---|---|---|
| Molybdenum | 2.70 – 3.20 % | 1.20 – 1.50 % |
| Vanadium | 0.40 – 0.60 % | 0.85 – 1.15 % |
The molybdenum does the work you are paying for. It holds the tempered structure together at a higher service temperature, so hardness and strength survive longer into the heat, and the crack network that comes from repeated expansion and contraction takes longer to appear on the die face. That is the entire commercial reason a designer specifies this grade: not a harder die, a die that stays where it was for more shots.
Fewer hard vanadium carbides means less resistance to straight abrasion at lower temperatures. On tooling where the die is worn or eroded rather than crazed, H13 remains the correct grade and the cheaper one, and telling a customer so is worth more than selling him a block he did not need.
| Element | Window (%) | Element | Window (%) |
|---|---|---|---|
| C | 0.35 – 0.40 | Mo | 2.70 – 3.20 |
| Si | 0.30 – 0.50 | V | 0.40 – 0.60 |
| Mn | 0.30 – 0.50 | P | ≤ 0.030 |
| Cr | 4.80 – 5.20 | S | ≤ 0.020 |
The window above is EN ISO 4957 for X38CrMoV5-3. There is no AISI designation for this grade and no JIS designation either. It answers to 1.2367 and to X38CrMoV5-3, and to nothing else. That absence has a commercial consequence you can use.
Molybdenum 2.70 to 3.20 and vanadium 0.40 to 0.60 are the whole difference between this grade and H13, so the measured values for your heat, from our own optical emission spectrometer, are printed on the EN 10204 3.1 MTC against the heat number.
The certificate and your laboratory's report are compared line by line by the same method named on the certificate, and if a difference remains, a third-party laboratory you nominate retests the disputed piece and that result decides.
You can check that for the price of a courier. Cut a coupon from the block you have been sent, put it through any spectrometer, and read the molybdenum. Steel that was H13 when it left somebody's yard comes back at 1.2 to 1.5 percent, and it comes back before your customer has spent a single hour machining it.
Orders for this grade live in heavy sections, because the tools that drove the designer to specify it were heavy.
That is where the grade earns its cost, and it is also where a block can be wrong in a way nobody sees until the cavity is half cut.
Molybdenum is the reason. It is a strongly segregating element, so the alloy that was added to survive the heat is precisely the alloy most likely to distribute itself unevenly as a large ingot freezes.
A block whose centre is not the same steel as its surface: temper resistance that thins towards the core, a looser structure in the middle of the section, and a tool whose behaviour depends on how deep the cavity was sunk. The machinist finds it, or the die finds it later from the inside out.
Three things answer that, and all three are decided before the steel exists.
Every one of our fourteen grades is electroslag remelted, on ten furnaces, from ingots of 3 to 12 tonnes. Remelting under slag reforms the ingot progressively instead of all at once, which is what breaks up the segregation pattern the first solidification would otherwise lock in. The mechanism is set out on electroslag remelting, and the grain refinement that follows it under our EFS regime on EFS refining.
This is the decision that cannot be added later. The section you order decides the ingot before the heat is poured. For the heavy blocks 1.2367 is usually ordered in, our metallurgist writes a larger electroslag ingot onto the order so the minimum 4:1 reduction still lands on your section, and the heat number printed on your EN 10204 3.1 MTC is the heat that ingot was poured as.
It is the only one that can be done after the fact: every bar is ultrasonically inspected before release, which is what turns a claim about the core into a reading about the core.
Forging ratio is not a house average here; it is written onto each order against the grade and the finished section. A 4:1 minimum is easy to hold on a 100 mm bar from any ingot at all. Holding the same 4:1 into a 500 mm thick block means starting heavier, which means the ingot has to be chosen for your order rather than found afterwards. Our 2,500 tonne fast forging press was installed for that reason, alongside a 1,600 tonne press and a radial precision forging machine for the small sections, and it is what puts 500 mm thick material and 600 mm rounds inside the range at all.
How you check the first two without leaving your deskTake the heat number off the certificate and ask us for that heat's melting and forging record: ingot weight, finished section, the ratio between them. Production and inspection records are held for ten years, so the request is answerable whenever it arrives, including long after the die is in service. If the reduction was never written for your section, there is no record to produce and the silence tells you what you needed to know.
A block bought finished from somewhere else comes with a certificate that can be forwarded, but the decision behind it belonged to someone else and cannot be reconstructed on request.
Every bar is tested one at a time to SEP 1921 Class D/d or E/e, 100 per cent and not a sample.
We test and report to the ultrasonic acceptance class your order names, and each bar's own result is filed against the heat number. We do not publish a default class, because the class belongs to your customer's tool and not to our brochure.
That gives you two checks.
Charpy V-notch impact testing and non-metallic inclusion rating. Both are measured on your material and reported with the batch, which is a firmer answer than a claim of conformity to an acceptance standard we have not agreed to work to.
Heavy sections are what this grade is usually wanted in, and flat bar and plate reach 500 mm in thickness and 1200 mm in width, from a 20 mm minimum thickness and 200 mm minimum width; rounds cover Ø 16 up to Ø 600. Delivery is annealed only, 235 HB or below, with four surfaces to choose between.
| Item | Range |
|---|---|
| Round bar | Ø 16 – 600 mm |
| Flat bar and plate | 20 – 500 mm thick × 200 – 1200 mm wide |
| Surface | Black forged and descaled, peeled, ground, or milled on six faces |
| Allowance, black forged | 3 – 6 mm per side by section |
| Cut to length | ± 2 mm |
| Ground thickness | ± 0.05 mm |
| Milled flatness | ≤ 0.1 mm / m |
Peeled and ground material has the decarburised layer already removed, which matters more on this grade than on most: a die shop that machines through a heavy block and then finds soft skin at a critical face has lost the block, not a cut. Tell us what your customer does first on arrival and we will say which surface saves the most time.
1.2367 takes 44 to 52 HRC when worked through the route on the right — a property of the steel, developed in your customer’s furnace rather than a condition we deliver.
We deliver this grade annealed and nothing else. Annealed hardness is 235 HB or below, produced on eight bogie-hearth furnaces held to ±5 °C uniformity, with the charge cooled at 20 °C per hour or slower to below 600 °C before it comes out.
It is annealed again and retested. It is held back rather than shipped, and there is no concession route around that.
Read that as a property of the steel and a recommendation from us. We certify the condition we ship, which is the annealed hardness above; we do not certify a working hardness developed on equipment we do not run. Any supplier who guarantees 44 to 52 HRC on a delivery document is guaranteeing someone else's furnace.
Where it helps, our technical desk will write a suggested route against your actual section rather than the general one: send the block dimensions, the quenching medium available, and whether the tool will be nitrided or coated afterwards. Six people staff that desk and the answer comes back inside 24 hours on a working day. Grain size and carbide distribution are reported as measured on your heat, so the route can be discussed against real numbers instead of assumed ones.
This grade is made to order. Production runs 25 to 35 days and that covers melting, electroslag remelting, forging, annealing, finishing and the full inspection sequence, not a search through somebody's yard.
Rather than averaged, so the lines that can move sooner are not held behind this one and you can give your customer two dates instead of one soft date.
A first order can run as a trial before regular resupply starts. That is a verification route, not a retail counter: we supply distributors, stockholders and wholesalers, and we are not in the market you sell into.
Every batch ships with an EN 10204 3.1 MTC, signed by the quality department's authorised inspection representative. Quality reports to the general manager rather than to production, holds the release decision alone, and carries no output or delivery target, which is what makes the signature on a 3.1 document mean what the standard intends it to mean.
Those last two are reported as found. We publish no standing grain size figure for this grade, because a number printed in a catalogue does not travel with the steel and cannot be checked against anything. A rating tied to a heat number can be re-examined against the material in your yard for as long as the material exists.
Records and certificate copies. Where the destination market requires it, EU CBAM data and our TÜV carbon footprint documentation go out with the shipment, prepared here rather than reconstructed later by your compliance staff. The full document set is listed on about us.
Six lines get a complete answer in the first reply, inside 24 hours on a working day.
Exactly as the drawing writes it. If a drawing names a proprietary grade from another mill, send the text as written and we will quote against the EN window rather than assume the mapping.
With quantity per size. Round from 16 to 600 mm, flat and plate from 20 to 500 mm thick by 200 to 1200 mm wide.
Black forged, peeled, ground, or milled on six faces.
Class D/d or Class E/e, and whether Charpy impact values or an inclusion rating are to be added to the test schedule.
Die casting, extrusion or forging, the shot or cycle rate, and what the previous tool did before it came out. This is what tells us whether 1.2367 tool steel is actually the grade for the job or whether you should be quoting something else.
So the production window can be set against it before anyone commits.
Response in 24h on working days.
Email: wonderful@fcstoolsteel.com
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