Product Overview
The GX40CrNiSi25-12 Alloy Cast Steel Bracket (numeric designation 1.4837) is a high-performance load‑bearing component engineered for medium‑to‑high temperature service in oxidizing and mildly corrosive atmospheres. Manufactured to DIN EN 10295, this high‑chromium‑nickel‑silicon heat‑resistant cast steel forms a dense and stable chromium oxide scale under oxidising conditions, providing excellent resistance to scaling and spalling, combined with good thermal‑cycling endurance and adequate hot strength.
The typical chemical composition is: Chromium (Cr) 24–27%, Nickel (Ni) 11–14%, Silicon (Si) 1–2.5%, Carbon (C) 0.30–0.50%, with strictly controlled phosphorus and sulphur. This balanced alloy design delivers:
- Superior oxidation resistance – Chromium and silicon work synergistically to protect the material against scaling up to 1000–1050°C in continuous oxidising environments.
- Good structural strength at elevated temperatures – Moderate carbon content ensures sufficient load‑bearing capacity for medium‑duty hot sections.
- Thermal shock resistance – Withstands intermittent heating and cooling cycles without premature cracking.
- Sulphur‑containing atmosphere tolerance – Suitable for coal‑fired, oil‑fired and waste‑incineration applications where sulphur attack is a concern.
Compared with conventional grades such as 1.4848 (HH) or 1.4852 (HT), GX40CrNiSi25‑12 offers a more cost‑effective nickel content while utilising silicon to boost oxidation resistance – making it an economical yet reliable choice for supporting structures where anti‑scaling performance is paramount.
Typical Applications
GX40CrNiSi25‑12 alloy cast steel brackets are widely used in the following industrial sectors:
- Heat‑treatment furnace internals – hearth rail supports, tray carrier beams, guide brackets
- Petrochemical fired heaters – tube supports, return‑bend holders, furnace tube hangers
- Cement and lime rotary kilns – kiln hood supports, burner fixing brackets
- Glass annealing lehrs – roller‑table support brackets inside annealing lehrs
- Metallurgical reheating furnaces – walking‑beam fixed and moving beam supports
- Waste‑to‑energy and HRSG plants – grate bar supports, ash hopper brackets
- Non‑ferrous melting furnaces – charging table supports, launder brackets
Comprehensive Customisation – Far More Than One Material
At Juhe Yulong Special Steel Co., Ltd., we understand that every project faces unique service conditions. We therefore offer complete custom‑casting solutions – from material selection and dimensions, right through to casting, heat treatment and finishing.
| Material Grade | Numeric Code | Key Characteristics | Recommended Service Temperature |
| GX40CrNiSi25‑12 | 1.4837 | Oxidation‑resistant, economical heat‑resistant steel | ≤ 1050°C |
| GX40CrSi23 | 1.4740 | Ni‑free, low‑cost oxidation‑resistant grade | ≤ 1050°C |
| GX40CrNiSi27‑4 | 1.4827 | High Cr, low Ni, good sulphur‑corrosion resistance | ≤ 1100°C |
| GX40CrNiSi25‑20 | 1.4848 | Austenitic (HH type), higher hot strength | ≤ 1100°C |
| GX40CrNiSi35‑25 | 1.4852 | High Ni+Cr, carburisation‑resistant (HT type) | ≤ 1150°C |
| GX50CrNi32‑30 | 1.4865 | Premium heat‑resistant grade (HX type) | ≤ 1200°C |
| Wear‑resistant alloy cast steels (e.g. ZG40CrMnSi) | - | Abrasion and impact resistant | Ambient ~ 600°C |
| Austenitic stainless steels (CF8, CF8M) | 1.4308, 1.4408 | Corrosion‑resistant, low‑temperature tough | Ambient ~ 800°C |
- We can assist you in selecting the most cost‑effective material based on your operating temperature, atmosphere (oxidising/reducing/carburising), load type and budget.
Full Dimensional & Geometric Customisation
- Size range – from small connecting brackets weighing a few kilograms to large heavy‑duty support frames weighing several tonnes.
- Structural forms – L‑shaped, U‑shaped, flat, box‑type, and non‑standard complex geometries, all produced to your engineering drawings.
- Wall thickness optimisation – using FEA to optimise section transitions, reduce stress concentrations and minimise weight.
- Tolerance control – casting tolerances can meet CT9–CT12; machining allowances can be left on critical mating faces and finished to exact dimensions.
Integrated Post‑Processing & Inspection
- Heat treatment – stress‑relief annealing or solution annealing available to eliminate residual stresses and stabilise microstructure.
- Surface finishing – as‑cast, shot‑blasted (Sa2.5), ground, or coated with high‑temperature anti‑corrosion paint.
- Non‑destructive testing (NDT) – penetrant (PT), magnetic particle (MT), radiography (RT) and ultrasonic (UT) inspection offered to guarantee internal integrity.
- Machining services – equipped with gantry mills, vertical lathes and CNC machining centres for precision machining of mounting faces, bolt holes, locating slots, etc.
Shandong Juhe Yulong Special Steel Co., Ltd. was established in the early 21st century (2003) and is located in the Qingyun County Economic Development Zone, Dezhou City, Shandong Province. We are an integrated manufacturer specialising in melting, tooling, casting, heat treatment, machining and quality inspection of special‑steel castings. Our facility covers an area of over 33,000 m² with an annual output exceeding 8,000 tonnes of heat‑ and wear‑resistant castings, exported to Europe, North America, Southeast Asia and the Middle East.
Our Core Strengths
01
Multi‑Process
Capability
We offer a complete range of casting processes – including green sand, resin‑bonded sand, investment (lost‑wax), centrifugal, and bi‑metal composite techniques – so we can select the most suitable method for your bracket's geometry, dimensional accuracy, and order quantity. This flexibility ensures the optimal balance between quality and cost, whether you need small precision connectors or large heavy‑section supports.
02
Vertically Integrated Manufacturing
All key production steps – from electric‑arc furnace melting and on‑site spectrographic analysis, through pouring, fettling, heat treatment, to final machining – are performed under one roof. This complete in‑house control guarantees consistent material compliance, full traceability, and competitive lead times, while our inspection equipment (spectrometer, universal tester, metallurgical microscope, MPI/UT) ensures every casting meets your specified requirements.
03
Decades of Experience & Technical Expertise
Our core team has over 20 years of hands‑on experience in heat‑resistant steel casting, especially in handling high‑Cr and high‑Si grades – with proven know‑how in feeding, crack prevention and gas‑porosity control. This ensures that our brackets do not fail prematurely due to internal defects when exposed to high temperatures. We have long‑term cooperative relationships with heat‑treatment equipment manufacturers and petrochemical engineering companies worldwide, accumulating extensive field data that enables us to propose pre‑emptive improvements for your specific service conditions.
04
Reliable Logistics & After‑Sales Service
We collaborate with major international shipping lines to provide seamless sea and land transport, ensuring safe delivery of even oversized castings. We offer a 12‑month quality guarantee and commit to re‑casting or repairing any casting defect (not caused by misuse) without charge.
Technical Specifications – GX40CrNiSi25‑12 Bracket
| Parameter | Specification |
| Material grade | GX40CrNiSi25‑12 (1.4837) |
| Standard | DIN EN 10295 / equivalent to related ASTM A297 grades |
| Chemical composition (%) | C:0.30–0.50, Si:1.0–2.5, Mn≤2.0, Cr:24–27, Ni:11–14, Mo≤0.5, P≤0.04, S≤0.03 |
| Recommended service temperature | ≤ 1050°C (continuous oxidising atmosphere) |
| Density | approx. 7.8 g/cm³ |
| Tensile strength (R.T.) | ≥ 440 MPa (typical) |
| Yield strength | ≥ 230 MPa |
| Elongation | ≥ 6% |
| Casting process | Sand casting / resin‑sand / investment casting (selected as required) |
| Heat treatment condition | Stress‑relief annealed or solution‑treated (upon agreement) |
| Surface finish | As‑cast, shot‑blasted, or machined (optional) |
| NDT options | PT, MT, RT, UT (per customer request) |
Why Choose Us?
- Guaranteed material compliance – every heat is spectrographically verified to match GX40CrNiSi25‑12 composition.
- Process adaptability – the same bracket design can be produced via different casting methods to balance cost and quality for your order quantity.
- Flexible customisation – whether you need standardised batch brackets or one‑off non‑standard special shapes, we accept all custom orders.
- Rapid response – technical review and quotation provided within 48 hours of receiving drawings; expedited service available for urgent requests.
- Hassle‑free after‑sales – we guarantee to repair or re‑cast any casting‑related defect (not due to improper use) at no extra cost.
Request Your Custom Solution
If you are looking for a cost‑effective, oxidation‑resistant heat‑resistant steel bracket, or require custom castings in other grades (e.g. 1.4848, 1.4865, wear‑resistant alloys, etc.), please send us your drawings or operating condition details. Our engineers will provide professional material selection advice and structural optimisation suggestions.
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