Valve Material Properties
Release Date:
2026-06-18
1> Material Grade Table (GB/T 1220-2007)
| Abbreviation |
Unified Digital Code |
New grade |
Old grade |
Category |
|
304 |
S30408 |
06Cr19Ni10 |
0Cr18Ni9 |
Austenitic stainless steel |
|
316 |
S31608 |
06Cr17Ni12Mo2 |
0Cr17Ni12Mo2 |
Austenitic stainless steel |
|
316L |
S31603 |
022Cr17Ni12Mo2 |
00Cr17Ni14Mo2 |
Austenitic stainless steel |
|
630(17-4PH) |
S51740 |
05Cr17Ni4Cu4Nb |
0Cr17Ni4Cu4Nb |
Precipitation-hardening stainless steel |
|
2507 |
S25073 |
022Cr25Ni7Mo4N |
-- |
Super Duplex Stainless Steel |
2> Relationship between Withstand Voltage and Temperature
The pressure‑bearing capacity of metal fittings and valves decreases at elevated temperatures. The strength (pressure‑bearing capacity) of metallic materials declines with decreasing operating temperature; refer to the table below for the corresponding relationship.
| Fittings, valves Material |
Proportion of reduction in component strength (withstand voltage) at different operating temperatures (°C) |
|||||||||||||
|
≤+20 |
+50 |
+100 |
+120 |
+150 |
+200 |
+250 |
+300 |
+350 |
+400 |
+450 |
+500 |
+550 |
+600 |
|
|
304 stainless steel |
Unchanging |
↓7% |
↓17% |
↓20% |
↓25% |
↓30% |
↓34% |
↓37% |
↓40% |
↓42% |
↓44% |
↓46% |
↓48% |
- |
|
316 stainless steel |
Unchanging |
↓5% |
↓15% |
↓18% |
↓22% |
↓28% |
↓32% |
↓35% |
↓38% |
↓40% |
↓41% |
↓42% |
↓44% |
↓47% |
3> Material Mechanical Properties Table
1. Stainless steel bars (GB/T 1220-2007), duplex stainless steel (GB/T 21833.2-2020)
| Material/Heat Treatment Condition |
Allowable Stress for Valve Design (MPa) |
Allowable stress |
Non-proportional provisions |
Tensile strength |
Hardness |
||||||
|
Tensile stress |
Compressive stress |
Cutting should |
Torsional stress |
HRC |
HBW |
HRB |
HV |
||||
|
304/Solution Treatment |
120 |
156 |
78 |
74 |
137 |
≥205 |
≥520 |
- |
≤187 |
≤90 |
≤200 |
|
316/Solution Treatment |
120 |
156 |
78 |
74 |
137 |
≥205 |
≥520 |
- |
≤187 |
≤90 |
≤200 |
|
316L/Solution Treatment |
106 |
138 |
68 |
64 |
120 |
≥175 |
≥480 |
- |
≤187 |
≤90 |
≤200 |
|
2507/Solution Treatment |
192 |
230 |
115 |
109 |
296 |
≥530 |
≥770 |
≤32 |
≤300 |
- |
- |
|
Aging at 630/620℃ |
232 |
278 |
139 |
132 |
340 |
≥725 |
≥930 |
≥28 |
≥277 |
- |
- |
|
Aging at 630/580℃ |
- |
- |
- |
- |
- |
≥865 |
≥1000 |
≥31 |
≥302 |
- |
- |
|
Aging at 630/550℃ |
- |
- |
- |
- |
- |
≥1000 |
≥1070 |
≥35 |
≥331 |
- |
- |
|
Aging at 630/480℃ |
- |
- |
- |
- |
- |
≥1180 |
≥1310 |
≥40 |
≥375 |
- |
- |
2. Stainless steel castings
| Material/Heat Treatment Condition |
Allowable Stress for Valve Design (MPa) |
Allowable stress |
Non-proportional provisions |
Tensile strength |
|||
|
Tensile stress |
Compressive stress |
Cutting should |
Torsional stress |
||||
|
CF8(304)/Solution Treatment |
96 |
125 |
63 |
59 |
110 |
≥190 |
≥485 |
|
CF8M (316) / Solution Treatment |
96 |
125 |
63 |
59 |
110 |
≥190 |
≥485 |
3. Carbon steel and low-alloy steel forgings (diameter ≤ Ф100 mm)
Material/Heat Treatment Condition |
Allowable Stress for Valve Design (MPa) |
Allowable stress |
Yield strength |
Tensile strength |
|||
|
Tensile stress |
Compressive stress |
Cutting should |
Torsional stress |
||||
|
20# Steel/Normalizing |
95 |
124 |
62 |
59 |
152 |
≥235 |
≥410 |
|
35# Steel/Normalizing |
118 |
154 |
76 |
73 |
177 |
≥265 |
≥510 |
|
16Mn/Normalizing |
110 |
144 |
72 |
68 |
178 |
≥305 |
≥480 |
4> Surface Treatment of Carbon Steel Parts
1. White zinc plating with a sealing agent: No red rust after 168 hours in the neutral salt spray test (NSS). 2. Color zinc plating: No red rust after 240 hours. 。
5> Allowable Compressive Stress for Plastic Seals and Gaskets !! Sealing gaskets in enclosed spaces can withstand higher operating stresses.
Material Name |
Material grade |
Hardness |
Allowable compressive stress [σ] (allowable bearing pressure) |
|
|
No sliding friction |
There is sliding friction. |
|||
|
Polytetrafluoroethylene |
PTFE |
55HSD |
10MPa |
7.5MPa |
|
Enhanced Polytetrafluoroethylene |
RPTFE (20% glass fiber) |
60HSD |
11.8MPa |
8.8MPa |
|
PTFE+CF (15% carbon fiber + 5% graphite) |
62HSD |
12.5MPa |
9.4MPa |
|
|
Polyoxymethylene |
POM |
80HSD |
50MPa |
38MPa |
|
Polyether ether ketone |
PEEK |
86HSD |
68MPa |
51MPa |
Other technical documents
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Valve Dimensional Tolerances, Deviations, and Fits
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Stainless steel fittings and valve body dimensions
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