Soft Steel Molds
When You Need More Than Aluminum
✓ 10,000–50,000 Shots
✓ 15–20 Day Lead Time
✓ ISO 13485
✓ AS9100D
✓ In-House Tooling
What Are Soft Steel Molds?
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What Are Soft Steel Molds? |
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Definition |
Soft steel molds (also called pre-hardened steel molds) are made from materials like P20, S50C, or NAK80 – steels that are machinable in their pre-hardened state (typically 28–32 HRC). They offer significantly longer mold life than aluminum (10,000–50,000 shots) while maintaining faster lead times and lower cost than fully hardened steel. |
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Positioning |
They are the natural upgrade path when your project outgrows aluminum rapid tooling – whether due to higher volume, abrasive materials, or longer production runs. |
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Key Value |
✓ 5–10x longer life than aluminum ✓ Handles glass-filled and abrasive materials ✓ Same 15–20 day lead time ✓ Cost-effective for medium volumes |
Soft Steel vs. Aluminum vs. Hardened Steel
| Comparison | Aluminum Molds | Soft Steel Molds (Aptprototype) | Hardened Steel Molds |
| Best For | 500–5,000 parts, market testing, bridge production | 10,000–50,000 parts, medium-volume production, glass-filled materials | 500,000+ parts, high-volume mass production |
| Mold Life | 500–5,000 shots | 10,000–50,000 shots | 500,000–1,000,000+ shots |
| Lead Time | 7–10 days | 15–20 days | 4–8 weeks |
| Tooling Cost | $3,000–$8,000 | $8,000–$15,000 | $15,000–$50,000+ |
| Material Hardness | ~150 HB (soft) | 28–32 HRC (pre-hardened) | 48–62 HRC (fully hardened) |
| Abrasive Materials | Limited (wear occurs faster) | Excellent – handles glass-filled, mineral-filled, flame-retardant grades | Best for highly abrasive materials |
| Design Changes | Easy to modify | Moderate – can be welded and re-machined | Difficult / expensive |
If aluminum tooling is the "bridge" from prototype to production, soft steel is the "production highway" for medium volumes – especially when abrasive materials are involved.
Why Choose Soft Steel Molds? (5 Key Advantages)
| Advantage | Description | Value to You |
| 🔩 Longer Mold Life | 10,000–50,000 shots – 5–10x longer than aluminum | Run longer production campaigns without tool failure or frequent replacements |
| ⚙️ Excellent Wear Resistance | Handles glass-filled, mineral-filled, and flame-retardant materials | Use engineering-grade materials without wearing out your tool |
| ⏱️ Fast Lead Times | 15–20 day lead time – much faster than hardened steel | Get into production in weeks, not months |
| 💰 Cost-Effective | 30–50% less than fully hardened steel | Perfect for medium volumes where hardened steel is overkill |
| 🛠️ Modifiable | Can be welded and re-machined for design changes | Flexibility to iterate, even at medium volumes |
| Parameter | Specification |
| Mold Life | 10,000 – 50,000 shots (depending on material) |
| Standard Lead Time | T1 samples: 15–20 days · Full production: 20–25 days |
| Mold Material | P20, S50C, NAK80 (pre-hardened, 28–32 HRC) |
| Cavity Configuration | Single-cavity, multi-cavity (2–4 cavities), or family molds |
| Maximum Part Size | Up to 600mm x 500mm (customizable) |
| Surface Finishes | As-molded, textured (MT 11000–11030), polished, EDM finish, laser etching |
| Supported Materials | All production-grade resins, including: ABS, PC, PP, Nylon 6/6, Nylon 12, PEEK, PMMA, POM, TPE/TPU, glass-filled grades, mineral-filled grades, flame-retardant compounds |
| Quality Standards | ISO 13485 and AS9100D compliant · Full CMM inspection reports available · Material certifications provided |
Soft Steel Mold Workflow
Steps
Process
LT
Delivery
1
Upload CAD
< 1 hr
File received, project created
2
DFM Analysis
24–48 hrs
Free design feedback + optimization for steel tooling
3
Quote & Approval
24–48 hrs
Transparent pricing, no surprises
4
Mold Design
2–3 days
3D mold design for your approval
5
CNC Machining
7–10 days
High-precision steel mold machining
6
T1 Sampling
Day 15–20
First shots shipped for approval
7
Production Run
5–10 days
10,000–50,000 parts molded
8
Quality Inspection
In-process
Dimensional report, material certs
9
Shipping
1–3 days
Parts delivered to your door
Key Promise: T1 samples in 15–20 days. Full transparency throughout the process.
FAQ
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What's the difference between soft steel and hardened steel?
Soft steel (P20, NAK80) comes pre-hardened to 28–32 HRC and is machinable. Hardened steel (H13, S136) is machined soft, then heat-treated to 48–62 HRC – offering longer life but longer lead times and higher cost. -
When should I choose soft steel over aluminum?
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Can soft steel molds be modified after T1?
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What materials are soft steel molds best for?
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How does cost compare to aluminum and hardened steel?
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Do you provide samples before full production?
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How do I start?