Bolt - Double Arming | Bolts | Nuts, Bolts, Washers China LaiWu XinCheng
ASTM A193: B7, B7M, B16, B8 class 1, B8 class 2, B8M class 1, B8M class 2, B8T etc.
ASTM A320: L7, L7M, L43, B8 class 1, B8 class 2, B8M class 1, B8M class 2, B8T etc.
Sizes:1/4'' to 4''
1.Know A193 B7 & A193 B7M
1)ASTM A193 is alloy steel bolting material for pressure vessels, valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
Material according to ASTM A193 B7 is often available in national coarse (UNC) thread pitches, if being used in traditional applications, threads are specified 8 threads per inch (tpi) for diameters above one inch.
2)ASTM A193 Grade B7M bolts and studs are identical in chemistry to Grade B7 (quenched and tempered medium carbon alloy steel), but have lower strength requirements and require 100% hardness testing of all fasteners manufactured in the lot. Grade B7M bolts resist chloride, sulfide, and hydrogen stress corrosion cracking (SCC) and are frequently used in sour gas service.
2.A193 B7 & A193 B7M Raw material chemical composition
| Element |
B7 / B7M (AISI 4140) |
| Carbon |
0.38 - 0.48% |
| Manganese |
0.75 - 1.00% |
| Phosphorus, max |
0.04% |
| Sulfur, max |
0.04% |
| Silicon |
0.15 - 0.35% |
| Chromium |
0.80 - 1.10% |
| Nickel |
|
| Molybdenum |
0.15 - 0.25% |
3.
.A193 B7 & A193 B7M Property
| Grade |
Sizes |
Tensile ksi, min |
Yield, ksi, min |
Elong, %, min |
RA % min |
HBW |
HRC |
| A193 B7 |
Up to 2-1/2 |
125 |
105 |
16 |
50 |
321 max |
35 max |
| 2-5/8 - 4 |
115 |
95 |
16 |
50 |
| 4-1/8 - 6 |
100 |
75 |
18 |
50 |
4.Surface protection: Plain, Hot dip galvanized, Galvanization, Dacroment, Xylan .
5.Packing: Standard packing or According to custome
6.Payment terms: T/T or L/ C
(1)30% paid by T/T and rest 70% by T/T upon the copy of B/B.
(2)100% irrevocable L/C at sight
7.MOQ:5tons
8.Delivery time:7-30 days upon to the order details
9.Trade term: FOB CFR CIF
10. Mark: including steel material, heat No., pieces, weight, date and so on.
11.Know us more:
Q: Are you manufacturer or trading company ?
A: We have factory producing threaded rods for more than 20 years, We owned more than 20 sets of producing equipments.
Q: What's your sample policy ?
A: Our sample is free, but customer may need to pay the express cost.
Q: What's your MOQ ?
A: The MOQ is 100pieces,
Q: What's your delivery time?
A: Generally, our delivery time is 30 days after deposit received, we can adjust our production if your order is urgent.
Q: What's your payment term:
A: Usually, if amount is less than 1000usd, we suggest payment through west union , if amount above 1000usd, we suggest TT or LC.
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