Best Stainless is proud to offer type 410 QDT stainless steel bars, engineered specifically for petrochemical applications involving sour gas hydrogen sulfide (H2S) environments. QDT stands for "Quenched and Double Tempered" - a specialized heat treatment process that relieves internal stresses and eliminates untempered martensite for superior performance in critical applications.
Our 410 QDT bars deliver a minimum yield strength of 80 KSI with maximum hardness of RC22, meeting stringent requirements for H2S-containing environments per NACE MR0175 and MR0103 standards. These bars also comply with API 6A standards, making them the preferred choice for demanding petrochemical applications where standard 410 stainless steel isn't sufficient.
Why Choose 410 QDT Over Standard 410?
- NACE Compliant - Meets MR0175/MR0103 standards for sour gas H2S service
- API 6A Certified - Approved for critical oilfield applications
- Stress Relieved - Double tempering eliminates internal stresses
- Controlled Hardness - RC22 max ensures optimal toughness
- Superior Toughness - Enhanced Charpy impact resistance at -20°F
Typical Applications
- Oilfield Sour Gas Service
- H2S Resistant Components
- Valve Bodies & Trim
- Pump Shafts & Sleeves
- Wellhead Equipment
- Downhole Tools
- Pipeline Components
- Pressure Vessel Parts
410 QDT Mechanical Properties
| Property | 410 QDT Specification | Standard 410 (Typical) |
|---|---|---|
| Tensile Strength | 100 ksi min | 70-120 ksi |
| Yield Strength | 80-95 ksi | 40-90 ksi |
| Elongation | 20% min | 12-16% |
| Reduction of Area | 40% min | 40-45% |
| Hardness | 207-235 BHN (RC22 max) | Varies by condition |
| Charpy Impact (-20°F) | 20 ft-lbs avg min | Not specified |
Chemical Composition
Primary Elements
- Carbon: 0.08-0.15%
- Chromium: 12.5-13.5% (aim 13% min)
- Manganese: 0.40-1.0%
- Silicon: 0.15-0.50%
- Iron: Balance
Trace Elements (Max %)
- Sulfur: 0.005%
- Phosphorus: 0.020%
- Molybdenum: 0.50%
- Nickel: 0.50%
- Copper: 0.25%
Available Diameters & Lengths
Standard Lengths: 20' minimum to 24' random lengths
| Small Diameters | Medium Diameters | Large Diameters | Quote |
|---|---|---|---|
| 1-1/4", 1-3/8" | 3", 3-1/4", 3-1/2" | 8", 10", 16" | Quote » |
| 1-1/2", 1-5/8" | 3-3/4", 4", 4-1/4" | 17", 18", 19" | Quote » |
| 1-3/4", 2" | 4-1/2", 4-3/4" | 20", 21" | Quote » |
| 2-1/4", 2-1/2" | 5", 5-1/4", 5-1/2" | Custom sizes available | Quote » |
| 2-3/4" | 6", 6-1/2", 7" | — | Quote » |
* Additional diameters may be available upon request. Contact us for availability.
Compliance Standards
Chemical Standards
- AISI 410-UNS S41000
- ASTM A276/479/484
- ASME SA276/479/484
- QQS 763F
Industry Compliance
- NACE MR0175/ISO 15156-3
- NACE MR0103
- API 6A PSL-3, ISO 10423
- EN 10204 3.1 Certification
Materials conform to all requirements of the above specifications, with enhanced mechanical properties as noted.
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