With 20 years of expertise and a smart factory system, we cut and machine materials to your exact specifications, delivering with precision and speed. Our two-plant structure (DAEKOOK STEEL and HANMIN METAL) handles diameters from 10Φ to 530Φ.
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Trust, credibility, and value. DAEKOOK STEEL and HANMIN METAL strive to earn our clients' trust by delivering the value they seek, surely and precisely.
Drawing on 20 years of expertise, skilled personnel, and an extensive network — combined with our Smart Factory System — we do our utmost to earn your confidence and trust.
DAEKOOK STEEL is a materials specialist that cuts and machines special steel, stainless, and alloy materials to customer specifications. We manage the entire process — from order and material preparation to cutting, precision machining, dimensional inspection, and packaging & shipping.
Our smart factory system digitizes and monitors on-site work with remote control capability, achieving fast and accurate delivery with consistent quality.
Precision cutting with dedicated equipment for every specification.
Chemical composition (%) of major grades. (scroll horizontally)
| 강종 / Grade | UNS No | 규격 / Spec | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Fe | Al | Ti | W | Co | OTHER |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SM20C | – | – | 0.18~0.23 | 0.15~0.35 | 0.30~0.60 | 0.03 | 0.035 | 0.2 | – | – | 0.3 | – | – | – | – | – | – |
| SM45C | – | – | 0.42~0.48 | 0.15~0.35 | 0.60~0.90 | 0.03 | 0.035 | 0.2 | – | – | 0.3 | – | – | – | – | – | – |
| SCM440 | – | – | 0.38~0.43 | 0.15~0.35 | 0.60~0.85 | 0.03 | 0.03 | 0.25 | 0.90~1.20 | 0.15~0.30 | 0.3 | – | – | – | – | – | – |
| AISI 4140 | – | – | 0.38~0.43 | 0.15~0.35 | 0.75~1.00 | 0.035 | 0.04 | – | 0.80~1.10 | 0.15~0.25 | – | – | – | – | – | – | – |
| SNCM439 | – | – | 0.36~0.43 | 0.15~0.35 | 0.60~0.90 | 0.03 | 0.03 | 1.60~2.00 | 0.60~1.00 | 0.15~0.30 | – | – | – | – | – | – | – |
| AISI 4340 | – | – | 0.38~0.43 | 0.15~0.35 | 0.60~0.80 | 0.035 | 0.04 | 1.65~2.00 | 0.70~0.90 | 0.20~0.30 | – | – | – | – | – | – | – |
| F1554 Gr.36 | – | – | 0.28 | – | – | 0.05 | 0.06 | – | – | – | 0.2 | – | – | – | – | – | – |
| F1554 Gr.55 | – | – | 0.3 | 0.5 | 1.35 | 0.04 | 0.05 | – | – | – | 0.2 | – | – | – | – | – | – |
| F1554 Gr.105 | – | – | – | – | – | 0.048 | 0.058 | – | – | – | 0.2 | – | – | – | – | – | – |
| STS304 | – | – | 0.08 | 1 | 2 | 0.045 | 0.03 | 8.00~10.50 | 18.0~20.0 | – | – | – | – | – | – | – | – |
| B8 CL1 , CL2 | – | A193/A320 | 0.08 | 1 | 2 | 0.045 | 0.03 | 8.0~11.0 | 18.0~20.0 | – | – | – | – | – | – | – | – |
| A2 50,70 | – | – | 0.1 | 1 | 2 | 0.05 | 0.03 | 8.0~19.0 | 15.0~19.0 | – | – | – | – | – | – | – | – |
| STS316 | – | – | 0.08 | 1 | 2 | 0.045 | 0.03 | 10.0~14.0 | 16.0~18.0 | 2.00~3.00 | – | – | – | – | – | – | – |
| B8M CL1,CL2 | – | A193/A320 | 0.08 | 1 | 2 | 0.045 | 0.03 | 10.0~14.0 | 16.0~18.0 | 2.00~3.00 | – | – | – | – | – | – | – |
| A4 70,80 | – | – | 0.08 | 1 | 2 | 0.045 | 0.03 | 10.0~15.0 | 16.0~18.5 | 2.00~3.00 | – | – | – | – | – | – | – |
| Ni 200 | N02200 | B160 | 0.15 | 0.35 | 0.35 | – | 0.01 | 99 | – | – | 0.25 | 0.4 | – | – | – | – | – |
| Monel 400 | N04400 | B164 | 0.3 | 0.5 | 2 | – | 0.024 | 63 | – | – | 28.0~34.0 | 2.5 | – | – | – | – | – |
| Monel K500 | N05500 | B865 | 0.18 | 0.5 | 1.5 | – | 0.01 | 63.0~70.0 | – | – | 27.0~33.0 | 2 | 2.30~3.15 | 0.35~0.85 | – | – | – |
| Inconel 718 | N07718 | B637 | 0.08 | 0.35 | 0.35 | 0.015 | 0.015 | 50.0~55.0 | 17.0~21.0 | 2.8~3.3 | 0.3 | Remainder | 0.20~0.80 | 0.65~1.15 | – | – | 1.0 Cb+Ta 4.75~5.50 |
| C-276 | N10276 | B574 | 0.01 | 0.08 | 1 | 0.04 | 0.03 | Remainder | 14.5~16.5 | 15.0~17.0 | – | 4.0~7.0 | – | – | 3.0~4.5 | – | 2.5 B. max 0.35 |
| 904L | N08904 | – | 0.02 | 1 | 2 | 0.04 | 0.03 | 23.0~28.0 | 19.0~23.0 | 4.0~5.0 | 1.0~2.0 | Balance | – | – | – | – | N:0.10 |
| Alloy625 | N06625 | B446 | 0.1 | 0.5 | 0.5 | 0.015 | 0.015 | 58 | 20.0~23.0 | 8.0~10.0 | – | 5 | 0.4 | 0.4 | – | 1 | Cb+Ta 3.15~4.15 |
| 660 | S66286 | A453 | 0.08 | 0.40~1.00 | 0.40~1.00 | 0.04 | 0.03 | 24.0–28.0 | 12.0–15.0 | 2.0–3.5 | 0.5 | – | 0.35 | 1.80–2.10 | – | – | – |
| Incoloy 825 | N08825 | B425 | 0.05 | 0.5 | 1 | – | 0.03 | 38.0~46.0 | 19.5~23.5 | 2.5~3.5 | 1.5~3.0 | min 22.0 | 0.2 | 0.60~1.20 | – | – | – |
| Incoloy 925 | N08925 | – | 0.03 | 0.5 | 1 | – | 0.03 | 42.0~46.0 | 19.5~22.5 | 2.5~3.5 | 1.5~3.0 | min 22.0 | 0.10~0.50 | 1.9~2.4 | – | – | Cb. max 0.50 |
| F51 | S31803 | A182/A276/A479 | 0.03 | 1 | 2 | 0.03 | 0.02 | 4.5~6.5 | 21.0~23.0 | 2.5~3.5 | – | – | – | – | – | – | N:0.08~0.20 |
| F60 | S32205 | A182/A276/A479 | 0.03 | 1 | 2 | 0.03 | 0.02 | 4.5~6.5 | 22.0~23.0 | 3.0~3.5 | – | – | – | – | – | – | N:0.14~0.20 |
| F53 | S32750 | A182/A479 | 0.03 | 0.8 | 1.2 | 0.035 | 0.02 | 6.0~8.0 | 24.0~26.0 | 3.0~5.0 | 0.5 | – | – | – | – | – | N:0.24~0.32 |
| F55 | S32760 | A182/A276/A479 | 0.03 | 1 | 1 | 0.03 | 0.01 | 6.0~8.0 | 24.0~26.0 | 3.0~4.0 | 0.50~1.00 | – | – | – | 0.50~1.00 | – | N:0.20~0.30 |
| F44 | S31254 | A182/A276/A479 | 0.02 | 0.8 | 1 | 0.03 | 0.01 | 17.5~18.5 | 19.5~20.5 | 6.0~6.5 | 0.50~1.00 | – | – | – | – | – | N:0.18–0.22 |
| F61 | S32550 | A182/A276/A479 | 0.04 | 1 | 1.5 | 0.04 | 0.03 | 4.5~6.5 | 24.0~27.0 | 2.9~3.9 | 1.50~2.50 | – | – | – | – | – | N:0.10~0.25 |
| XM-19 | S20910 | A193/A276/A479 | 0.06 | 1 | 4.0~6.0 | 0.045 | 0.03 | 11.5~13.5 | 20.5~23.5 | 1.50~3.00 | – | – | – | – | – | – | N:0.20~0.40 Cb:0.10~0.30 V:0.10~0.30 |
| B8S | S21800 | A193 | 0.1 | 3.5~4.5 | 7.0~9.0 | 0.06 | 0.03 | 8.0~9.0 | 16.0~18.0 | – | – | – | – | – | – | – | N:0.08~0.18 |
A smart factory built on real-time equipment data and AI analysis — delivering higher quality, fewer defects, and on-time delivery.
We collect operating and production data from every cutting machine in real time, then analyze it to drive higher quality, fewer defects, and reliable delivery.
Composition and dimensional inspection data is logged across every process, ensuring consistent quality through full pre-shipment verification.
AI analysis of accumulated equipment and production data detects defect factors in advance and prevents recurrence.
Real-time production monitoring enables accurate delivery forecasting, while remote control ensures flexible response to urgent orders.
Every step from order to shipment is digitally logged, so accurate production information is always available on request.
From carbon & alloy steel to stainless and nickel/special alloys.
Inspection agency service is available for major classification societies.
Heat treatment by grade and standard (ASTM, JIS, etc.), with post-machining delivery.
Test specimens can be tested and analyzed by KOLAS-accredited labs per international standards.
Certified to KS Q ISO 9001:2015 Quality Management System.
