8 catalogued sizes, cast to ASTM A297 HK40. Pick any row and the technical drawing redraws to it.
Exhaust Elbow (Heat Resistant) to ASTM A297 HK40 are catalogued in nominal bore DN15 to DN80, with length 67-215 mm, height 67-215 mm, port diameter 21.8-93.2 mm. 8 sizes are held in the table below, and the technical drawing redraws to whichever row you select.
Specification
ASTM A297 HK40
Alloys
HK40, WCB, AISI 4140 Cast
Size range
DN15-DN80
Long
67-215 mm
Catalogued sizes
8
Dimensions are nominal casting dimensions before machining allowance. Confirm the tolerance grade and the machined features against your drawing before ordering.
Alloys & Grades
The Exhaust Elbow (Heat Resistant) is cast in 7 of the 63 grades we work in. Those are listed first; the full reference tree is underneath, with each designation shown alongside its ASTM/UNS, EN and GB equivalents.
HK40catalog gradeASTM A297 HK40 / UNS J94204
WCBASTM A216 WCB / UNS J03002
AISI 4140 CastASTM A732 Gr 4140 / UNS G41400 (42CrMo4)
AISI 8620 CastASTM A732 Gr 8620 / UNS G86200
HK30ASTM A297 HK30 / UNS J94203 (GX40CrNiSi25-12)
A356 / A356-T6ASTM B26 A356-T6 / AlSi7Mg0.3
Ti-6Al-4V (Grade 5)ASTM B367 Gr C-5 / UNS R56400 (Ti-6Al-4V)
Browse all 63 cast grades we work instainless · carbon & low-alloy · nickel & cobalt · copper · aluminium · titanium
C83600 Red BrassASTM B584 C83600 · UNS C83600 · 85-5-5-5
C87600 Silicon BrassASTM B584 C87600 · UNS C87600
C86300 Manganese BronzeASTM B584 C86300 · UNS C86300
Aluminum Alloy Castings
A356 / A356-T6ASTM B26 A356 · UNS A13560 · AlSi7Mg0.3 · EN AC-42000
A357ASTM B26 A357 · UNS A13570 · AlSi7Mg0.6
355 / C355ASTM B26 355 · UNS A03550 · AlSi5Cu1Mg
A201-T7ASTM B26 A201 · UNS A02010 · AlCu4MgTi
Titanium Castings
Ti-6Al-4V (Grade 5)ASTM B367 Gr C-5 · UNS R56400 · TC4 · Ti-6-4
CP Titanium Grade 2ASTM B367 Gr C-2 · UNS R50400
Special & Wear Alloys
Ni-Resist D-2ASTM A439 D-2 · UNS F43000
High-Chrome White IronASTM A532 Class III · 25Cr white iron
Technical Drawing
Every parameter below is editable, and the drawing redraws to match the values you choose. Picking a size snaps the other fields to that size's values; you can then override any one of them.
Sends the selected values to the quote form below.
Request a Quotation for Exhaust Elbow (Heat Resistant)
The form below follows the current drawing configuration. Change the values above and the request updates with them. Attaching a drawing or a STEP file is the fastest route to a firm price.
Dimensions & Parameters (ASTM A297 HK40)
Nominal casting dimensions before machining allowance. Every row is a starting point for the customizer above — pick any size and the drawing redraws to it.
Size
Overall Length L (mm)
Overall Height H (mm)
Port Diameter ØD (mm)
Internal Diameter Ød (mm)
Wall Thickness T (mm)
Flange Diameter ØD1 (mm)
Bend Radius R (mm)
Casting Weight (kg)
DN15
67
67
21.8
15
3.4
89
22.5
0.31
DN20
79.5
79.5
27.2
20
3.6
99
30
0.43
DN25
91.5
91.5
32.8
25
3.9
108
37.5
0.58
DN32
106.5
106.5
40.4
32
4.2
117
48
0.8
DN40
123.5
123.5
49.2
40
4.6
127
60
1.13
DN50
151
151
60.2
50
5.1
152
75
1.84
DN65
186.5
186.5
76.6
65
5.8
178
97.5
3.1
DN80
215
215
93.2
80
6.6
190
120
4.56
The Exhaust Elbow (Heat Resistant) conforms to ASTM A297 HK40. As a vehicle casting, it is defined by the dimensions in the table below; this page also covers the alloy options, the surface finish and the machining allowance.
What Is a Exhaust Elbow (Heat Resistant)?
The Exhaust Elbow (Heat Resistant) is a vehicle casting. It is selected by nominal bore together with the wall thickness and the hole or port geometry shown in the table below, and is supplied in a range of alloys and surface conditions to suit the service.
How This Part Is Cast
The flow passage is cored in wax, so the bore and the bend are cast to shape and the wall thickness stays constant around the curve — which a machined or fabricated equivalent cannot hold. The ends are machined to the flange face or weld prep after casting, and the bend radius is set by the pattern.
Alloy Options
The catalog specification calls for HK40. This part is supplied in HK40, WCB, AISI 4140 Cast, AISI 8620 Cast, HK30, A356 / A356-T6 and Ti-6Al-4V (Grade 5). The alloy drives both price and lead time more than any other choice on the RFQ, so state it if your drawing calls one out — and if it does not, describe the service (the medium, the temperature and the pressure) and we will propose one.
Tolerances, Finish & Machining
As-cast dimensions are held to ISO 8062-3 DCTG 6-8 on a silica sol shell, which is roughly ±0.3 mm on a 50 mm feature and widens with size. As-cast surface finish is typically Ra 3.2-6.3 µm. A machining allowance of 1.5-3 mm is added to the faces called out on the drawing; every other surface is supplied as-cast. Flange faces, the bolt circle and the bore are machined after casting so they meet the flange standard rather than the casting tolerance. State the tolerance grade and the finish you need on the RFQ — both change the price, and a tolerance nobody asked for is the most common avoidable cost on a casting.
Inspection & Testing
Chemical composition by spectrometer on every heat, with the certificate supplied against the specified grade.
Dimensional inspection against the drawing, with a first-article report on new tooling.
Hydrostatic shell test at 1.5 times the rated pressure, per the applicable pressure standard.
Radiographic or dye-penetrant examination of the pressure boundary where the order calls for it.
Verification of the heat-treatment condition and, on request, elevated-temperature mechanical testing.
The Exhaust Elbow (Heat Resistant) is made to order. Pricing starts from approximately US$16.80 per piece for the smallest listed size in HK40 at production quantity; the final figure depends on pour weight, alloy, machining scope, surface finish and order quantity, and tooling is a separate one-time charge. Submit the configuration above for a firm quotation.
Inside the plant
Manufactured in our own plant
This part is cold-formed, threaded, heat-treated and finished in-house. The stages below are where its class and finish are actually decided.
01
Tooling & wax injection
An aluminum die is cut from your drawing or 3D model, and wax is injected into it under pressure. Everything downstream is a copy of this pattern, so the die is where the tolerance is actually decided — not on the shop floor afterwards.
First-article dimensional report on every new die before production wax is run.
02
Tree assembly & gating
Patterns are welded onto a wax runner to form a tree. How they are gated is not cosmetic: the gate positions decide which sections solidify last, and a heavy section fed from the wrong direction is where shrinkage porosity comes from.
Gating reviewed against the part's heaviest section before the first tree is built.
03
Ceramic shell building
The tree is dipped in ceramic slurry and stuccoed with refractory grain, six to eight times, drying between coats. The face coat is what the casting surface copies, which is why a silica sol face gives Ra 3.2-6.3 µm where a water-glass shell gives a coarser one.
Slurry viscosity and drying room temperature and humidity logged per coat.
04
Dewaxing
A steam autoclave melts the wax out fast, so that the wax — which expands more than the ceramic does — leaves before it can split the shell. Recovered wax is filtered and reused for gating rather than for patterns.
Every shell inspected for cracks after dewax; a cracked shell is scrapped, not patched.
Video: Exhaust Elbow (Heat Resistant)
Third-party video, selected automatically for this topic. It is not produced by Lost Wax Casting and is not a specification source — use the tables on this page for dimensional data.
Frequently Asked Questions
What standard is the Exhaust Elbow (Heat Resistant) cast to?
The Exhaust Elbow (Heat Resistant) is cast to ASTM A297 HK40. The dimensions on this page follow that specification, and the material certificate supplied with the order is issued against it.
What sizes are available for the Exhaust Elbow (Heat Resistant)?
The table on this page lists 8 sizes for the Exhaust Elbow (Heat Resistant) by nominal bore, from DN15 to DN80. Sizes outside the table are quoted on request — investment casting is tooled per part, so a new size is a new pattern die rather than a stock item.
Which alloys is the Exhaust Elbow (Heat Resistant) cast in?
The catalog specification calls for HK40. The Exhaust Elbow (Heat Resistant) is supplied in HK40, WCB, AISI 4140 Cast, AISI 8620 Cast, HK30 and A356 / A356-T6. The alloy drives both the price and the lead time more than any other choice on the RFQ, so state it if your drawing calls one out — and if it does not, describe the service (the medium, the temperature and the pressure) and we will propose one.
What wall thickness does the Exhaust Elbow (Heat Resistant) have?
The listed sizes run from 3.4 mm to 6.6 mm of nominal wall. Investment casting will hold a section down to about 1.5 mm in the silica sol shell used here — 0.6 mm on a small isolated feature — and the thin end of that range is a shell-filling question rather than a strength one. A section much heavier than the surrounding wall is the more common problem: it solidifies last and shrinks, so it is fed or cored rather than left solid.
Is the Exhaust Elbow (Heat Resistant) pressure tested?
Yes. The Exhaust Elbow (Heat Resistant) is a pressure-retaining part, so the shell is hydrostatically tested at 1.5 times the rated pressure per the applicable pressure standard, and radiographic or dye-penetrant examination of the pressure boundary is available where the order calls for it. State the pressure class and the test standard on the RFQ.
How do I request a quotation?
Set the configuration on the technical drawing above — size, alloy, finish — and click "Request this configuration". The values carry into the quote form below it. Attach a drawing or a STEP file if you have one; it is the fastest route to a firm price, and it lets us flag any castability issue before you commit to tooling.
Guides for the Exhaust Elbow (Heat Resistant)
Each grade changes the price, the weight and what the part survives, so there is a page per grade for this part: HK40 (the catalog grade), WCB (the carbon-steel cost baseline), HK30 (for exhaust-gas temperature), AISI 4140 Cast (quench-and-tempered, highest loaded), AISI 8620 Cast (case hardening, for gear teeth) and A356 / A356-T6 (a third of the density).
How it is shelled decides the tolerance and the surface you get, and the tolerance band is worked out against this part's own dimensions on each: Silica Sol Casting (DCTG 5 – 7, Ra 3.2 – 6.3 µm), Water Glass Casting (DCTG 7 – 9, Ra 6.3 – 12.5 µm) and Composite Shell Casting (DCTG 6 – 8, Ra 6.3 – 12.5 µm).
If the question is still whether a casting is the right way to make this part at all, the Exhaust Elbow (Heat Resistant) application guide covers where it is used, what has to be decided before a price exists, and where investment casting is the wrong answer.
Need a casting quote or a castability review?Message our engineers on WhatsApp — send a drawing or DIN number and get pricing back fast.Start WhatsApp Chat →
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